Skip to main content
Logo for WebMD
Logo for WebMD
  • Coronavirus Update
  • Check Your Symptoms
  • Find A Doctor
  • Find A Dentist
  • Connect to Care
  • Find Lowest Drug Prices
  • Health
    A-Z
    Health A-Z
    Health A-Z
    Common Conditions
    • ADD/ADHD
    • Allergies
    • Arthritis
    • Cancer
    • Coronavirus (COVID-19)
    • 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
    • Newsletters
    • Best Hospitals
    • Find a Doctor
    • Children's Conditions A-Z
    • Surgeries and Procedures A-Z
    • Featured Topics
    • woman experiencing chest discomfort Symptom Checker COVID-19: Check Your Symptoms Now
    • photo of migraine Slideshow Get Help for Migraine Relief
  • Drugs &
    Supplements
    Drugs & Supplements
    Drugs & Supplements
    Find & Review
    • Drugs
    • Supplements
    Drug Basics & Safety
    • Commonly Abused Drugs
    • Taking Meds When Pregnant
    Tools
    • Manage Your Medications
    • Pill Identifier
    • Check for Interactions
    • Drug Comparison Tool
    • Featured Topics
    • assorted vitamins Slideshow Vitamins You Need as You Age
    • photo of vaccine Coronavirus COVID-19 Vaccines
  • Living
    Healthy
    Living Healthy
    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
    • Featured Topics
    • grocery cart Article Smart Grocery Shopping When You Have Diabetes
    • walking sneakers Quiz Do You Know the Benefits of Walking?
  • Family &
    Pregnancy
    Family & Pregnancy
    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
    • Featured Topics
    • apple slices and peanut butter Slideshow Smart Snacks When You're Pregnant
    • photo of dogs kissing Slideshow Surprising Things You Didn't Know About Dogs and Cats
  • News &
    Experts
    News & Experts
    News & Experts
    Health News
    • How to Tell if You Have Long COVID
    • Will Australia’s ‘Twindemic’ Reach the U.S. This Fall?
    • Biden’s COVID Symptoms Continue to Improve
    • First U.S. Polio Case in Nearly a Decade Reported in New York
    • Poll: What Doctors Wish Patients Knew About Their Work
    Experts & Community
    • Support Groups
    • WebMD Blogs
    • News Center
    • Dr. Whyte's Book: Take Control of Your Diabetes Risk
    • Featured Topics
    • photo of alzheimer's concept Special Report Will We Ever See an End to Alzheimer’s?
    • photo of person typing Get Our Newsletters Health News and Information, Delivered to Your Inbox
  • Mobile Apps
  • Subscriptions
  • Sign In
  • Subscribe
  • My Profile
    • My Tools
    • My WebMD Pages
    • My Account
    • Sign Out

    Health Guides A-Z

    • Health A-Z
    • Slideshows A-Z
    • Quizzes A-Z
    • Assessments A-Z
    • Videos A-Z
    • Q&As A-Z
    • Medical Tests A-Z
    • Surgeries and Procedures A-Z
    • Children's Conditions A-Z
    • Tools A-Z

    Health A-Z Home

    • News
    • Reference
    • Slideshows
    • Quizzes
    • Videos
    • WebMDRx Savings Card

    Top 12 Topics

    • Coronavirus (COVID-19)
    • CBD Oil
    • 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
    • A to Z Guides

    Health A-Z

    • Common Topics
    • All Health Topics
    • All
    • a
    • b
    • c
    • d
    • e
    • f
    • g
    • h
    • i
    • j
    • k
    • l
    • m
    • n
    • o
    • p
    • q
    • r
    • s
    • t
    • u
    • v
    • w
    • x
    • y
    • z
    • a

      • Acne
      • ADD-ADHD
      • ADHD in Children Health Center
      • Adult Vaccines
      • Allergies
      • Alzheimers
      • Ankylosing Spondylitis
      • Anorexia Nervosa
      • Anxiety Panic
      • Arthritis
      • Asthma
      • Atrial Fibrillation
      • Autism
      View More
    • b

      • Baby Center
      • Back Pain
      • Binge Eating Disorder
      • Bipolar Disorder
      • Birth Control
      • Bladder Cancer
      • Blog - ADHD
      • Blog - ADHD in Children
      • Blog - Ankylosing Spondylitis
      • Blog - Asthma
      • Blog - Atopic Dermatitis
      • Blog - Atrial Fibrillation
      • Blog - Breast Cancer
      • Blog - Cancer
      • Blog - Childhood ADHD Expert Blog
      • Blog - Cholesterol Management
      • Blog - COPD
      • Blog - Crohn's Disease
      • Blog - Deep Vein Thrombosis
      • Blog - Depression
      • Blog - Diet & Nutrition
      • Blog - Eye Health
      • Blog - Food and Fitness
      • Blog - From Our Archives
      • Blog - Healthy Sex
      • Blog - Healthy Skin
      • Blog - Heart Health
      • Blog - HIV
      • Blog - Lung Cancer
      • Blog - Lupus
      • Blog - Men's Health
      • Blog - Mental Health
      • Blog - Migraine
      • Blog - Multiple Myeloma
      • Blog - Multiple Sclerosis
      • Blog - My Experience
      • Blog - Ovarian Cancer
      • Blog - Pain Management
      • Blog - Pet Health
      • Blog - Prostate Cancer
      • Blog - Psoriasis
      • Blog - Psoriatic Arthritis
      • Blog - Public Health
      • Blog - Relationships
      • Blog - Rheumatoid Arthritis
      • Blog - Schizophrenia
      • Blog - Sleep Disorders
      • Blog - Substance Abuse
      • Blog - Type 2 Diabetes
      • Blog - Ulcerative Colitis
      • Blog - WebMD Doctors
      • Blog - WebMD Interviews
      • Blog - Women's Health
      • Blogs
      • Blogs - Expert
      • Blogs - Patient
      • Brain and Nervous System
      • Brain Cancer
      • Breast Cancer
      • Bulimia Nervosa
      View More
    • c

      • Cancer
      • Carpal Tunnel Syndrome
      • Cataracts
      • Cats
      • Celiac Disease
      • Cervical Cancer
      • Children's Health
      • Cholesterol Management
      • Chronic Fatigue Syndrome
      • Cold and Flu
      • Colorectal Cancer
      • Connect to Care - Addiction Treatment & Recovery
      • Connect to Care - Addiction Treatment & Recovery - Alcohol
      • Connect to Care - Addiction Treatment & Recovery - Methamphetamine
      • Connect to Care - Hair Loss
      • Connect to Care - Hearing Loss
      • Connect to Care - Lasik
      • Connect to Care - Sleep Apnea
      • Connect to Care - Teeth Straightening
      • COPD
      • COVID-19 Vaccine
      • Crohns Disease
      View More
    • d

      • Depression
      • Diabetes
      • Digestive Disorders
      • Dogs
      • Drugs and Medications
      • DVT
      View More
    • e

      • Ear Infection
      • Eating Disorders
      • Eczema
      • Endometriosis
      • Epilepsy
      • Erectile Dysfunction
      • Eye Health
      View More
    • f

      • Fibromyalgia
      • First Aid
      • Food Poisoning
      View More
    • g

      • Genital Herpes
      View More
    • h

      • Hair Loss
      • Health & Baby
      • Health & Balance
      • Health & Cooking
      • Health & Diet
      • Health & Fitness
      • Health & Parenting
      • Health & Sex
      • Health A-Z
      • Health Insurance and Medicare
      • Healthy Beauty
      • Healthy Seniors
      • Heart Disease
      • Heart Failure
      • Heart Health
      • Heartburn/GERD
      • Hepatitis
      • HIV AIDS
      • HPV/Genital Warts
      • Hypertension
      View More
    • i

      • Infertility and Reproduction
      • Inflammatory Bowel Disease Crohns Disease
      • Irritable Bowel Syndrome
      View More
    • j

      View More
    • k

      • Kidney Stones
      • Knee Pain
      View More
    • l

      • Lung
      • Lung Cancer
      • Lupus
      View More
    • m

      • Macular Degeneration
      • Melanoma Skin Cancer
      • Men's Health
      • Menopause
      • Mental Health
      • Metabolic Syndrome
      • Migraines Headaches
      • Multiple Myeloma
      • Multiple Sclerosis
      View More
    • n

      • Non-Hodgkin's Lymphoma
      View More
    • o

      • Oral Health
      • Osteoarthritis
      • Osteoporosis
      • Ovarian Cancer
      View More
    • p

      • Pain Management
      • Palliative Care
      • Pancreatic Cancer
      • Parkinson's
      • Pets
      • PMS
      • Postpartum Depression
      • Prostate Cancer
      • Prostate Enlargement BPH
      • Psoriasis
      • Psoriatic Arthritis
      View More
    • q

      View More
    • r

      • Raising Fit Kids
      • Restless Legs Syndrome Center
      • RFK Food
      • RFK Mood
      • RFK Move
      • RFK Recharge
      • RFK Weight
      • Rheumatoid Arthritis
      View More
    • s

      • Schizophrenia
      • Sexual Conditions
      • Sexual Health
      • Shingles
      • Skin Problems and Treatments
      • Sleep Apnea
      • Sleep Disorders
      • Smoking Cessation
      • Stress Management
      • Stroke
      • Substance Abuse and Addiction
      View More
    • t

      • Teen Boys
      • Teen Girls
      • Teen Health
      View More
    • u

      • Ulcerative Colitis
      • Urinary Incontinence OAB
      • Uterine Fibroids
      View More
    • v

      • Vaccines
      • Vitamins and Supplements
      View More
    • w

      • Weight Loss & Obesity
      • Women's Health
      View More
    • x

      View More
    • y

      View More
    • z

      View More

    Today on WebMD

    Puppy digging hole

    Risky Mistakes Pet Owners Make

    Some of these might surprise you.

    woman eating

    Depressed, Guilty Feelings After Eating?

    Symptoms of binge eating disorder.

    psoriasis on female neck

    Psoriasis Home Remedies

    14 tips to ditch the itch.

    pack of cigarettes

    Quit Smoking

    Get your personalized plan.

    Recommended for You

    nerve damage Slideshow

    Multiple Sclerosis Symptoms

    womans smile Slideshow

    10 Secrets to a Sparkling Smile

    soda can Slideshow

    7 Ways You're Wrecking Your Liver

    Child with adhd Slideshow

    Symptoms of ADHD in Children

    Diabetes blood test strip Slideshow

    Type 2 Diabetes: Early Warning Signs

    paranoia Slideshow

    What Is Schizophrenia?

    Wet feet on shower floor tile Slideshow

    Fungal Infections: What You Should Know

    Chinese cabbage Slideshow

    11 Surprising Superfoods for Your Bones

    Tools & Resources

    • Foods That Help Enhance Your Brainpower
    • Breast Cancer Signs & Symptoms
    • Constipated? Avoid These Foods
    • Lung Cancer Risks: Myths and Facts
    • Causes of Erectile Dysfunction
    • Tips for Living Better With Migraine

    WebMD Special Sections

    • Find the Right Primary Care Doctor
    • What to Know About High Potassium

    Health Solutions

    • Penis Curved When Erect?
    • Could I have CAD?
    • Treat Bent Fingers
    • Treat HR+, HER2- MBC
    • Tired of Dandruff?
    • Benefits of CBD
    • Rethink MS Treatment
    • AFib-Related Strokes
    • Risk of a Future DVT/PE
    • Is My Penis Normal?
    • Relapsing MS Options
    • Liver Transplants Save Lives
    • Finance Plastic Surgery
    • Bent Finger Causes
    • Living With Psoriasis?
    • Missing Teeth?

    More from WebMD

    • 5 Tips to Help With Relapsing MS
    • How to Thrive With Narcolepsy
    • Relief for Blocked Hair Follicles
    • Psoriatic Arthritis and Your Sleep
    • What Psoriasis Feels Like
    • First Psoriatic Arthritis Flare
    • Talking to Your Doctor About RA
    • Crohn's: A 'Full-Body' Disease
    • Avoiding Crohn’s Flares
    • Health Benefits of Hemp Seed Oil
    • Live Better With Psoriatic Disease
    • Types of B-Cell Therapy for MS
    • 5 Health Benefits of Hemp
    • Why Prostate Cancer Spreads
    • Living with Advanced Breast Cancer
    • Where Breast Cancer Spreads
    • Logo for WebMD
      • Visit WebMD on Facebook
      • Visit WebMD on Twitter
      • Visit WebMD on Pinterest
    • Policies

      • Privacy Policy
      • Cookie Policy
      • Editorial Policy
      • Advertising Policy
      • Correction Policy
      • Terms of Use

      About

      • Contact Us
      • About WebMD
      • Careers
      • Newsletter
      • Corporate
      • WebMD Health Services
      • Site Map
      • Accessibility
    • WebMD Network

      • Medscape
      • Medscape Reference
      • MedicineNet
      • eMedicineHealth
      • RxList
      • OnHealth
      • WebMDRx
      • First Aid
      • WebMD Magazine
      • WebMD Health Record
      • Dictionary
      • Physician Directory
    • Our Apps

      • WebMD Mobile
      • WebMD App
      • Pregnancy
      • Baby
      • Allergy
      • Medscape

      For Advertisers

      • Advertise with Us
      • Advertising Policy

    © 2005 - 2019 WebMD LLC. All rights reserved.

    WebMD does not provide medical advice, diagnosis or treatment.

    See additional information.