20 Best 15 Tens Is The Same As [2024]

Are you looking for the best 15 tens is the same as? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling 15 tens is the same as.

We Recommended:

# Preview Product
1 Secura Electric Wine Opener, Automatic Electric Wine Bottle Corkscrew Opener with Foil Cutter,... Secura Electric Wine Opener, Automatic Electric Wine Bottle Corkscrew Opener with Foil Cutter,...
2 BLUE LOVE Abs Stimulator, Muscle Toner, Abs Stimulating Belt- Abdominal Toner Training Device for... BLUE LOVE Abs Stimulator, Muscle Toner, Abs Stimulating Belt- Abdominal Toner Training Device for...
3 AUVON Dual Channel TENS EMS Unit 24 Modes Muscle Stimulator for Pain Relief, Rechargeable TENS... AUVON Dual Channel TENS EMS Unit 24 Modes Muscle Stimulator for Pain Relief, Rechargeable TENS...
4 Tens Unit Plus 24 Rechargeable Electronic Pulse Massager Machine Multi Mode Device with All... Tens Unit Plus 24 Rechargeable Electronic Pulse Massager Machine Multi Mode Device with All...
5 Marvel Ultimate Periodic Table Of Elements Graphic T-Shirt Marvel Ultimate Periodic Table Of Elements Graphic T-Shirt
6 Paused My Game Graphic Novelty Sarcastic Funny T Shirt L Black Paused My Game Graphic Novelty Sarcastic Funny T Shirt L Black
7 Wired Gaming Keyboard for Mac PC PS5 PS4 Xbox One Gamers, RGB Backlit LED Mechanical Feel Keyboard... Wired Gaming Keyboard for Mac PC PS5 PS4 Xbox One Gamers, RGB Backlit LED Mechanical Feel...
8 NURSAL 24 Modes TENS Unit Muscle Stimulator with Continuous Stimulation, Rechargeable Electronic... NURSAL 24 Modes TENS Unit Muscle Stimulator with Continuous Stimulation, Rechargeable Electronic...
9 My Perfect Day Video Games Funny Cool Gamer Gift T-Shirt My Perfect Day Video Games Funny Cool Gamer Gift T-Shirt
10 Never Forget Graphic Novelty Sarcastic Funny T Shirt XL Charcoal Never Forget Graphic Novelty Sarcastic Funny T Shirt XL Charcoal
11 Chattanooga Primera TENS/NMES Unit with HAN Waveform Chattanooga Primera TENS/NMES Unit with HAN Waveform
12 Spectra par12-02 Parker Laboratories 360 Electrode Gel, 2 Oz. Tube, Clear Spectra par12-02 Parker Laboratories 360 Electrode Gel, 2 Oz. Tube, Clear
13 Feelin Good Tees People Should Seriously Sarcastic Funny T Shirt XL Black Feelin Good Tees People Should Seriously Sarcastic Funny T Shirt XL Black
14 StimChoice 4000 TENS Unit Muscle Stimulator and EMS Muscle Stimulator - 4 Channel TENS Machine... StimChoice 4000 TENS Unit Muscle Stimulator and EMS Muscle Stimulator - 4 Channel TENS Machine...
15 AUVON Dual Channel TENS Unit Muscle Stimulator (Family Pack), 20 Modes Rechargeable TENS Machine... AUVON Dual Channel TENS Unit Muscle Stimulator (Family Pack), 20 Modes Rechargeable TENS Machine...
16 NURSAL TENS EMS Unit Muscle Stimulator for Pain Relief Therapy, Electric 24 Modes Dual Channel TENS... NURSAL TENS EMS Unit Muscle Stimulator for Pain Relief Therapy, Electric 24 Modes Dual Channel...
17 Travel Power Strip, NTONPOWER 3 Outlets 3 USB Portable Desktop Charging Station Short Extension Cord... Travel Power Strip, NTONPOWER 3 Outlets 3 USB Portable Desktop Charging Station Short Extension...
18 My People Skills are Fine Funny T Shirt XL Black My People Skills are Fine Funny T Shirt XL Black
19 OMRON Pocket Pain Pro TENS Unit Muscle Stimulator, Simulated Massage Therapy for Lower Back, Arm,... OMRON Pocket Pain Pro TENS Unit Muscle Stimulator, Simulated Massage Therapy for Lower Back, Arm,...
20 Energizer AA Batteries, Max Double A Battery Alkaline, 24 Count Energizer AA Batteries, Max Double A Battery Alkaline, 24 Count
Bestseller No. 1
Secura Electric Wine Opener, Automatic Electric Wine Bottle Corkscrew Opener with Foil Cutter,...
  • Rechargeable Electric Wine Bottle Opener - Easily remove corks in seconds. Compatible with most wine bottle sizes. Open up to 30 bottles on a single...
  • Easy to Use - Simply place on top of your wine bottle, press a button, and tada, your wine is open and ready to serve
  • Small Footprint Saves Space - Our electric wine bottle opener is small enough to store discreetly away when not in use. Keep the charging base next to...
  • Makes an Amazing Present - An elegant color makes our electric wine bottle opener an attractive present, or use it at home, when catering, at...
  • Reliable product and service - 100-240V wide input voltage range covers The known voltages of most places in the world. We offer 12 months and...
Bestseller No. 2
BLUE LOVE Abs Stimulator, Muscle Toner, Abs Stimulating Belt- Abdominal Toner Training Device for...
  • 【Abs Stimulator】The muscle stimulator is for body muscle training. This EMS muscle stimulator can help to tone, tighten and strenghten your body...
  • 【Newest design】Abs muscle stimulator healthy sports technology uses bionic micro-current to design 6 modes and 10 intensity levels. You can select...
  • 【Powerful & Efficient】This Ultimate product is designed for training with 20 minutes per time, 1-2 times per day for 6+ weeks. 20-minute using...
  • 【Easy to use】To Begin Use Simply Apply The Gel Pads To Your Abs,Then Turn to Desired Intensity Level. Please read the Instructions before...
  • 【Manufacturer's Guarantee】100% money back guaranty for abs stimulator or any reason you are not satisfied with flex belt abdominal toning belt, We...
SaleBestseller No. 3
AUVON Dual Channel TENS EMS Unit 24 Modes Muscle Stimulator for Pain Relief, Rechargeable TENS...
  • TENS + EMS Combination Unit. AUVON TENS & PMS / EMS device combines 2 therapies in 1 device, in which TENS provides safe, non-invasive, drug-free...
  • Independent Dual Channel. You can choose different modes and intensities for channel A and channel B. For example, you could choose P1 mode in channel...
  • Multi-Functional with 24 Mode. 20 levels of intensity, 24 preprogrammed massage modes with adjustable time (maximum to 90 min). With built-in powerful...
  • Upgraded TENS Unit Pads. The Low impedance Solid Gel has been upgraded to the industry leading American adhesive, which can provide much better...
  • What You Receive: 1 x AUVON Dual Channel TENS machine, 12pcs 5cm x 5cm Electrode Pads, 2 x Lead Wires (1/2 Wire), 1 x USB cable, 1 x Pouch, 1 x...
Bestseller No. 4
Tens Unit Plus 24 Rechargeable Electronic Pulse Massager Machine Multi Mode Device with All...
  • TENS EMS Muscle Massager with multiple functions for pain relief and muscle stimulation. It can be used for all muscle soreness and any part of your...
  • Sciatica Pain Relief ; Back Massagr electronic device for body pain like lower back, sciatica or sore muscles. Small portable device with easy to use...
  • Dual Channel with 24 Massage Modes, 20 Intensity Level and adjustable timer for relaxation and pain managment. You can use 4 electrode pads at the...
  • Easy to use as well as simple. Just connect to pad cables and put the pads for an effective muscle stimulation. Simple interface,large front. Use "M"...
  • Package Includes : 1 Main Device, 1 Pair (2) Large Electrodes, 3 Pair (6) Mediuam Electrodes Pads, 1 Pair (2) Small Electrodes Pads, 1 Type-C Charger...
Bestseller No. 5
Marvel Ultimate Periodic Table Of Elements Graphic T-Shirt
  • Officially Licensed Marvel Apparel
  • 18MARV00081A
  • Lightweight, Classic fit, Double-needle sleeve and bottom hem
Bestseller No. 6
Paused My Game Graphic Novelty Sarcastic Funny T Shirt L Black
  • AWESOME FIT: Fits True to size, great fit and feel - Wash with cold water, inside out. Want to make dad look like a super star? This shirt has a great...
  • TOP QUALITY: Our Graphic Tees Professionally screen printed designed in USA. Nothing beats our selection of funny sarcastic tshirts! It will make...
  • GREAT FEEL: Our Shirts are 100% preshrunk cotton exceptions; AshGrey is 99/1cotton/poly; SportGrey is 90/10cotton/poly if available. Available in 2XL...
  • HAVE FUN: Get your humor on with this fun tee. The best funny tshirts. Sarcastic and novelty in one tee shirt. Birthday tshirt best cotton tee. Great...
  • MAKES GREAT GIFT: Graphic tee makes best gift idea. Christmas, Fathers Day, Mothers Day, gift friends, brother/sister. Welcome home gift. Long lasting...
Bestseller No. 7
Wired Gaming Keyboard for Mac PC PS5 PS4 Xbox One Gamers, RGB Backlit LED Mechanical Feel Keyboard...
  • With premium ABS,advanced craftsmanship on key caps,characters and symbols on keys will not worn off easily; Keystrokes of RGB gaming keyboard are...
  • USB wired keyboard boast 10 different color settings, possible to set RGB LED rainbow backlit wired keyboard up to light in one solid color, or multi...
  • LED lights are impressive,making sense to make the numbers, letters, punctuation and f-keys be different colors; comfortable to use for gaming,...
  • Ergonomic keyboard has stands at the bottom of backlit gaming keyboard to adjust rgb keyboard height, for comfortable typing or gaming. USB light up...
  • Computer keyboard with standard layout for Windows 98 / Me / 2000 / XP / Vista / Win 7 / Win8 / 10 / Vista Mac OS. Lit keyboard Works well with all...
SaleBestseller No. 8
NURSAL 24 Modes TENS Unit Muscle Stimulator with Continuous Stimulation, Rechargeable Electronic...
  • 24 Modes (TENS+EMS) & Steady Pulse - The 24 pre-programmed tens unit muscle stimulator Adapts Transcutaneous Electrical Nerve Stimulation technology...
  • Memory Function– NURSAL TENS machine remembers and sets the massage mode you have applied last time without selecting your preferred modes again and...
  • Adjustable 20 Intensity Levels & Timer – NURSAL rechargeable TENS unit - equipped with 20 adjustable intensity levels - allows you to customize the...
  • 8 Reusable Electrode Pads, 2 Outputs –The strong self-adhesive property was added in the reusable electrode pads thus enables much better...
  • What you will receive: 1 x TENS & EMS Machine, 4 Palm Electrode Pads, 2 Large Rectangle Pads, 2 Small Pads, 2 x 1/2 Lead Wires, 1 x 1/4 Lead Wires, 1...
Bestseller No. 9
My Perfect Day Video Games Funny Cool Gamer Gift T-Shirt
  • My perfect day, wake up, play video games, eat breakfast lunch dinner sleep tshirt. Cool funny humorous shirt for video game lovers, gamers, geeks,...
  • Perfect birthday gift for a gamer who loves videos games and can't stop gaming even with lag. Great gift for a gamer who plays video games all day and...
  • Lightweight, Classic fit, Double-needle sleeve and bottom hem
Bestseller No. 10
Never Forget Graphic Novelty Sarcastic Funny T Shirt XL Charcoal
  • AWESOME FIT: Fits True to size, great fit and feel - Wash with cold water, inside out. Want to make dad look like a super star? This shirt has a great...
  • TOP QUALITY: Our Graphic Tees Professionally screen printed designed in USA by Feelin Good Tees. Nothing beats our selection of funny sarcastic...
  • GREAT FEEL: Our Shirts are 100% preshrunk cotton exceptions; AshGrey is 99/1cotton/poly; SportGrey is 90/10cotton/poly if available. Available in...
  • HAVE FUN: Get your humor on with this fun tee. The best funny tshirts. Sarcastic and novelty in one tee shirt. Birthday tshirt best cotton tee. This...
  • MAKES GREAT GIFT: See all our funny tees! Graphic tee makes best gift idea. Christmas, Fathers Day, Mothers Day, gift friends, brother/sister. Welcome...
Bestseller No. 11
Chattanooga Primera TENS/NMES Unit with HAN Waveform
  • Extensive range of program options with 8 programs for TENS and 6 programs for NMES; TENS and NMES amplitude range of 0-80 mA
  • HAN TENS Waveform uses Dense-and-Disperse modes of stimulation where 2 Hz is alternating with 15 or 70 Hz, each lasting three seconds for maximum...
  • TENS system involves non-invasive nerve stimulation through small electrical currents which trigger your body to produce endorphins that help to...
  • NMES systems are used to reduce muscle spasms, tone weak muscles, and assist in the healing process through emission of electrical pulses to stimulate...
  • TENS and NMES systems together in one instrument provide a more well-rounded healing process; Features a proven circuit with over 10 years of reliable...
Bestseller No. 12
Spectra par12-02 Parker Laboratories 360 Electrode Gel, 2 Oz. Tube, Clear
  • Parker Labs 12-02
  • Product of choice for conductive rubber/carbon electrodes
  • Product of choice for ECG, TENS, monitoring and Pediatrics non-irritating, hypoallergenic, bacteriostatic salt-free, no Sodium ion transfer
  • Non-gritty stay-wet formula allows for prolonged use without re-application
Bestseller No. 13
Feelin Good Tees People Should Seriously Sarcastic Funny T Shirt XL Black
  • AWESOME FIT: Fits True to size, great fit and feel - Wash with cold water, inside out. This shirt has a great look and cool fit. This men's funny t...
  • TOP QUALITY: Our Graphic Tees Professionally screen printed designed in USA by Feelin Good Tees. Nothing beats our selection of funny sarcastic...
  • GREAT FEEL: Our Shirts are 100% preshrunk cotton exceptions; AshGrey is 99/1cotton/poly; SportGrey is 90/10cotton/poly if available. Available in 2XL...
  • HAVE FUN: Get your humor on with this fun tee. The best funny tshirts. Sarcastic and novelty in one tee shirt. Birthday tshirt best cotton tee. Great...
  • MAKES GREAT GIFT: See all our funny tees! Graphic tee makes best gift idea. Christmas, Fathers Day, Mothers Day, gift friends, brother/sister. Welcome...
Bestseller No. 14
StimChoice 4000 TENS Unit Muscle Stimulator and EMS Muscle Stimulator - 4 Channel TENS Machine...
  • GET IMMEDIATE PAIN RELIEF. Portable TENS unit comes with multiple TENS therapy modes that will provide instant muscle pain relief. An electrotherapy...
  • INCLUDES EMS, REHAB YOUR MUSCLE INJURY. EMS muscle stimulator included with 3 EMS recovery modes. E stim modes provide electric physical therapy as an...
  • 4 CHANNEL EMS TENS UNIT. StimChoice 4000 TENS unit provides TENS therapy and is a muscle stimulator, nerve stimulator, EMS unit, and electric massager...
  • A LEADER SINCE 2008: A TENS device from the maker of the TENS 7000, and electrical muscle stimulator that is pioneering physical therapy equipment for...
  • CLINICAL STRENGTH PAIN RELIEF. Electronic pulse massager for pain relief and rehab. Perfect for back pain relief, neck pain, carpal tunnel relief,...
SaleBestseller No. 15
AUVON Dual Channel TENS Unit Muscle Stimulator (Family Pack), 20 Modes Rechargeable TENS Machine...
  • Drug-Free Pain Relief. This TENS machine stimulates sensory nerves and muscles, activates specific natural pain gate mechanisms, relaxes your body,...
  • Separate Channel Control. Mode and intensity for A/B channels can be set differently, e.g. channel A of the muscle stimulator runs at 5 intensities in...
  • Rechargeable Lithium Battery. No more interrupted therapy worries due to dead batteries! This TENS unit allows for 20 hours of constant use and the...
  • 24Pcs Huge Pack. The upgraded industry-leading TENS pads offer better self-adhesion and 45 reusable lifespans. Pads are available in 2 size options to...
  • What You Receive: 1 x Dual Channel TENS Machine, 16 x Square 2" Electrode Pads, 8 x Rectangle 2"x4" Pads, 2 x Lead Wires, 1 x USB cable, 1 x Adapter,...
SaleBestseller No. 16
NURSAL TENS EMS Unit Muscle Stimulator for Pain Relief Therapy, Electric 24 Modes Dual Channel TENS...
  • A/B DUAL CHANNELS TENS: You can set separate modes and intensities for channel A and channel B, the TENS last memory function will remember your...
  • 24 MODES CHOICES FOR PAIN RELIEF: NURSAL electronic TENS device has 24 user-friendly pre-promgrammed massage modes, making it much easier to use than...
  • POWERFUL RECHARGEABLE BATTERY: No worries about treatment interruption for dead AA batteries any more! This tens massager can give you continuous use...
  • ADJUSTABLE TIMER & INTENSITY: The timer allows you to set a time of between 10-60 minutes, with the default set to 20 minutes. Twenty levels of...
  • ENJOY WITH THE PORTABLE DESIGN: This NURSAL TENS unit device comes with a carrying bag, allowing you to carry it anywhere when necessary. It comes...
SaleBestseller No. 17
Travel Power Strip, NTONPOWER 3 Outlets 3 USB Portable Desktop Charging Station Short Extension Cord...
  • [FOR NIGHTSTAND & TABLE DESK]: The USB desktop power strip with switch works great on your nightstand, home and office table desk to handle your...
  • [CRUISE MUST HAVES]: The non-surge protector, donut shaped power strip comes with 3 outlets / 3 USB ports and it is in perfect size that fits right in...
  • [15 INCH SHORT EXTENSION CORD]: Short power cord wrapping around which makes it easy to storage; compact & small enough to throw in your suitcase for...
  • [FULL-ROUND PROTECTIONS]: The travel cruise power strip is FCC & RoHS approved with high temp fireshield outer shell, ensuring complete protection...
  • [HASSLE FREE PURCHASE]: No worries at all if Amazon return window closed after1 month. Directly contact us within the 18 months warranty for...
Bestseller No. 18
My People Skills are Fine Funny T Shirt XL Black
  • AWESOME FIT: Fits True to size, great fit and feel - Wash with cold water, inside out. This shirt has a great look and cool fit. This men's funny t...
  • TOP QUALITY: Our Graphic Tees Professionally screen printed designed in USA by Feelin Good Tees. Nothing beats our selection of funny sarcastic...
  • GREAT FEEL: Our Shirts are 100% preshrunk cotton exceptions; AshGrey is 99/1cotton/poly; SportGrey is 90/10cotton/poly if available. Available in...
  • HAVE FUN: Get your humor on with this fun tee. The best funny tshirts. Sarcastic and novelty in one tee shirt. Birthday tshirt best cotton tee. Great...
  • MAKES GREAT GIFT: See all our funny tees! Graphic tee makes best gift idea. Christmas, Fathers Day, Mothers Day, gift friends, brother/sister. Welcome...
SaleBestseller No. 19
OMRON Pocket Pain Pro TENS Unit Muscle Stimulator, Simulated Massage Therapy for Lower Back, Arm,...
  • Tens technology: Utilizes Transcutaneous Electrical Nerve Stimulation (TENS) technology used by physical therapists and chiropractors for more than 40...
  • Personalized therapy: 3 pre-set body pain programs (Arm/Shoulder, Lower Back and Leg/Foot) and 2 massage-like modes (Knead and Steady) each with 10...
  • Portable tens unit muscle stimulator: Small, portable, easy-to-use, and can be used anywhere discreetly
  • Long life pads: Includes comfortable, self-adhesive Long Life Pads (1 pair) that are reusable up to 150 times and a plastic holder for storage
  • Safe & effective: 100% drug-free relief for multiple body pains
Bestseller No. 20
Energizer AA Batteries, Max Double A Battery Alkaline, 24 Count
  • 24 Pack of Energizer MAX alkaline AA batteries
  • Our Longest Lasting MAX AA battery powers everyday devices
  • Leak resistant construction protects your devices from leakage of fully used batteries for up to 2 years. Bonus: It’s guaranteed
  • Power for your nonstop family’s must have devices like toys, flashlights, clocks, remotes, and more
  • Holds power up to 10 years in storage so you’re never left powerless

Having trouble finding a great 15 tens is the same as?

This problem is well understood by us because we have gone through the entire 15 tens is the same as research process ourselves, which is why we have put together a comprehensive list of the best 15 tens is the same ass available in the market today.

After hours of searching and using all the models on the market, we have found the best 15 tens is the same as for 2023. See our ranking below!

How Do You Buy The Best 15 Tens Is The Same As?

Do you get stressed out thinking about shopping for a great 15 tens is the same as? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching 15 tens is the same as, which is why we have assembled a comprehensive list of the greatest 15 tens is the same as available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for 15 tens is the same as that you consider buying. Your questions might include the following:

  • Is it worth buying an 15 tens is the same as?
  • What benefits are there with buying an 15 tens is the same as?
  • What factors deserve consideration when shopping for an effective 15 tens is the same as?
  • Why is it crucial to invest in any 15 tens is the same as, much less the best one?
  • Which 15 tens is the same as are good in the current market?
  • Where can you find information like this about 15 tens is the same as?

We’re convinced that you likely have far more questions than just these regarding 15 tens is the same as, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for 15 tens is the same as, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible 15 tens is the same as. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an 15 tens is the same as buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available 15 tens is the same as currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of 15 tens is the same as has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an 15 tens is the same as?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your 15 tens is the same as.
  5. Customer Ratings: Number ratings grade 15 tens is the same as objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their 15 tens is the same as.
  7. Product Quality: You don’t always get what you pay for with an 15 tens is the same as, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an 15 tens is the same as is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining 15 tens is the same as information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding 15 tens is the same as is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

Related Post:

FAQ:

Q: Which is the best TENS unit to buy?

A: 1. NURSAL TENS Unit Rechargeable Muscle Stimulator 2. TENS 7000 2nd Edition Digital TENS Unit with Accessories 3. Healthmateforever FDA Cleared OTC YK15AB TENS Unit 4. TechCare Massager Tens Unit Plus 24 [Lifetime Warranty] 5. Easy@Home Rechargeable TENS Unit + EMS Muscle Stimulator 6. CUH Dual Channels TENS Unit Muscle Stimulator

Q: What is the difference between Ems and tens?

A: A TENS unit uses electricity to stimulate the nerves to block pain of several causes. On the other hand, an EMS unit uses electricity to stimulate the muscles and cause contraction. This can be used in muscle strengthening, rehabilitation, recovery from injury, and even cosmetic purposes.

Q: How many pads should a TENS unit have?

A: Since some TENS units can cost a pretty penny, if you want to get as many pads as possible, we would recommend investing in a model that comes with four instead of two. The cheaper options are often equipped with just two pads. Single-channel machines can’t be added any more channels or pads to. 7. How long should you use a TENS unit?

Q: How does a TENS unit work?

A: May 5, 2023 by Emma White TENS units send painless electrical signals through their pads to the nerves located under your skin, and having the best TENS unit to match your needs and requirements is a good start. These machines are excellent when it comes to relieving pain, whether it is acute or chronic.