Skip to main content

Close

Coronavirus Update
Check Your Symptoms
Find A Doctor
Find A Dentist
Find Lowest Drug Prices

Health
A-Z
Close
Health A-Z
Common Conditions
ADD/ADHD
Allergies
Arthritis
Cancer
Cold, Flu & Cough
Depression
Diabetes
Eye Health
Heart Disease
Lung Disease
Orthopedics
Pain Management
Sexual Conditions
Skin Problems
Sleep Disorders
View All
Resources
Symptom Checker
WebMD Blogs
Podcasts
Message Boards
Questions & Answers
Insurance Guide
Find a Doctor
Children's Conditions A-Z
Surgeries and Procedures A-Z
- Slideshow Get Help for Migraine Relief
- Slideshow Things That Can Hurt Your Joints
Drugs &
Supplements
Close
Drugs & Supplements
Find & Review
Drugs
Supplements
Tools
Manage Your Medications
Pill Identifier
Check for Interactions
Drug Basics & Safety
Commonly Abused Drugs
Taking Meds When Pregnant
- Slideshow Vitamins You Need as You Age
- Slideshow Supplements for Better Digestion
Living
Healthy
Close
Living Healthy
Diet, Food & Fitness
Diet & Weight Management
Weight Loss & Obesity
Food & Recipes
Fitness & Exercise
Beauty & Balance
Healthy Beauty
Health & Balance
Sex & Relationships
Oral Care
Living Well
Women's Health
Men's Health
Aging Well
Healthy Sleep
Healthy Teens
- Slideshow Which Food Has More Saturated Fat?
- Quiz Do You Know the Benefits of Walking?
Family &
Pregnancy
Close
Family & Pregnancy
All About Pregnancy
Getting Pregnant
First Trimester
Second Trimester
Third Trimester
View All
Parenting Guide
Newborn & Baby
Children's Health
Children's Vaccines
Raising Fit Kids
View All
Pet Care Essentials
Healthy Cats
Healthy Dogs
View All
- Slideshow Smart Snacks When You're Pregnant
- Quiz How Can You Avoid Homework Stress?
News &
Experts
Close
News & Experts
Health News
Medicare for All: What Does This Mean?
Do Blue Light Glasses Really Work?
Is It OK to Carry CBD on a Plane?
Have a Purpose, Have a Healthier Life
Flu: What You Should Know This Year
Experts & Community
Message Boards
WebMD Blogs
News Center
- WebMD Investigates Why Can't We Sleep?
- Newsletters Sign Up to Receive Our Free Newsletters

Sign In

Menu

Top 12 Topics

CBD Oil
Ruptured Achilles Tendon
Keto Diet
Hepatitis C
Diabetes Warning Signs
Rheumatoid Arthritis
Morning-After Pill
Breast Cancer Screening
Psoriatic Arthritis Symptoms
Heart Failure
Multiple Myeloma
Types of Crohn's Disease

Medical Dictionary

Anhidrosis

Share on Facebook

Share on Twitter

Share on Pinterest

Not being able to sweat.

WebMD Definition

© 2017 WebMD, LLC. All rights reserved.

Today on WebMD

Risky Mistakes Pet Owners Make

Some of these might surprise you.

Depressed, Guilty Feelings After Eating?

Symptoms of binge eating disorder.

Psoriasis Home Remedies

14 tips to ditch the itch.

Quit Smoking

Get your personalized plan.

Health SolutionsFrom Our Sponsors

Easy Glucose Monitoring
CAR T Cell Therapy
Got BPH Symptoms?
Myths About Epilepsy
Treatments for Psoriasis
Life With MS
Liver Transplants Save Lives
Is My Penis Normal?
Diagnosing Colorectal Cancer
Heart Care You Need
Innovative Cancer Care
Prep for Oral Surgery
Epilepsy Explained
At Home Health Care
Avoid Colds This Winter
Bent Fingers?

More from WebMD

MS: Tools to Keep Your Mind Sharp
Live Better With MS Assessment
What Is Endometriosis?
Life With Migraine
First Psoriatic Arthritis Flare
A Personal Story of RA
Beat Crohn's Flares
How Migraines Affect The Body
Immunotherapy for Lung Cancer
What Are Thrombocytopenia and ITP?
Have Hives? Things You Need to Know
Multiple Myeloma Explained
Stress and Psoriasis
Finding the Best MS Care Team
Why Prostate Cancer Spreads
Where Breast Cancer Spreads

- Find us on:
- Facebook
- Twitter
- Pinterest
Policies
About
WebMD Network
Our Apps
For Advertisers
- Advertise with Us
- Advertising Policy

© 2005 - 2020 WebMD LLC. All rights reserved.

WebMD does not provide medical advice, diagnosis or treatment.

See additional information.