WebMD - Better information. Better health. Skip to main content 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 Questions & Answers Insurance Guide Find a Doctor Children's Conditions A-Z Surgeries and Procedures A-Z Featured Topics Symptom Checker COVID-19: Check Your Symptoms Now 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 Slideshow Vitamins You Need as You Age Slideshow Supplements for Better Digestion 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 Article Smart Grocery Shopping When You Have Diabetes 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 Slideshow Smart Snacks When You're Pregnant Slideshow Surprising Things You Didn't Know About Dogs and Cats News & Experts News & Experts News & Experts Health News Coronavirus News COVID-19 Vaccines -- Latest Updates Coronavirus in Context: Interviews With Experts COVID-19 Symptoms Coronavirus Variants Experts & Community WebMD Blogs News Center Featured Topics WebMD News Get the Latest COVID-19 News Here 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 Requiring Vaccine Passports Raises Ethical Questions Experts are concerned about discrimination and whether length of immunity could make the passes invalid. CDC: Get Vaccinated and You Can Safely Travel Children Helping Variants Surge Coronavirus in Context COVID-19: 60 Seconds That Could Save Your Life How Will Society Reopening Affect Our Pets? Why Obesity May Worsen COVID-19 Outcomes Top Stories Life After Your COVID Vaccination: What to Do Why Do Some COVID Tests Hurt So Much? Will Drop in Common Viral Infections Lead to Masks Forever? After COVID, Many Have Long-Term Organ Damage Blood Type Doesn't Affect Your COVID Risk COVID-19 Vaccines: Get the Latest Updates Here WebMD 2021 Health Heroes: Pandemic Responders Bar Opening Leads to COVID-19 Outbreak Collagen: Can It Really Help With Skin and Joints? CDC Investigating Salmonella Outbreak Tied to Birds View more Top Stories NEW Find a reputable provider in your area with WebMD Care. Search doctors, conditions, or procedures Zip code or City, State See Cold & Flu activity in your area Trending Topics COVID-19 Symptoms COVID-19 Vaccines Coronavirus Variants Long COVID (PASC) Peptides Cultured Meat Vaginal Probiotics Snail Mucin Food Poisoning in Dogs Revenge Bedtime Procrastination Conversations WebMD Blogs | Expert Perspectives, Personal Stories #160; Get Strong, Toned Legs Without Squats or Lunges See what our certified personal trainer suggests. Read Full Post Gina Harney | Food and Fitness WebMD WebMD Magazine Poll Let Us Help You Save Money on Your Meds Print Your Savings CardStart Here Featured Health Topics BRAIN & NERVOUS Foods That Help You Focus Adding these foods and drinks to your diet may improve attention, memory, and brain function. ATRIAL FIBRILLATION Treatment Options DEEP VEIN THROMBOSIS Symptoms & Dangers of DVT SCHIZOPHRENIA How Common Is It? CHILD ADHD Tips to Stay On Task MENOPAUSE How to Manage Symptoms SEXUAL HEALTH Causes of Erectile Dysfunction Living Healthy MEN'S HEALTH Flat Abs Moves for Men HEALTH & BALANCE Can't Concentrate? DIGESTIVE HEALTH Best and Worst Foods for Your Liver TRYING TO CONCEIVE Facts to Help You Get Pregnant ORAL HEALTH Protect Your Pearly Whites WOMEN'S HEALTH Superfoods for Women SMOKING CESSATION Serious About Quitting Smoking? SEXUAL HEALTH What's Killing Your Sex Drive? HEALTH & BALANCE Make Changes That Stick Popular Tools BMI Calculator WebMDRx -- Find Lowest Drug Prices Ovulation Calculator Fitness Calorie Counter Food Calorie Counter Due Date Calculator SYMPTOM CHECKER You have symptoms. We have answers. Get Started Health A - Z ADHD Allergies Alzheimer's Anxiety Disorders Arthritis Asthma Back Pain Cancer Cholesterol Cold, Flu, & Cough COPD Depression Diabetes Digestive Disorders Eye Health Heart Health Heartburn/GERD Hypertension Mental Health Migraines Multiple Sclerosis Oral Care Orthopedics Osteoporosis Psoriasis Rheumatoid Arthritis Sexual Conditions Skin Problems Sleep Disorders See All Health Conditions Health Solutions Penis Curved When Erect Could I have CAD? Treat Bent Fingers Discover hATTR Symptoms Tired of Dandruff? Treat HR+, HER2- MBC Rethink MS Treatment AFib-Related Strokes Risk of a Future DVT/PE Is My Penis Normal? Relapsing MS Options Enlarged Prostate Facts Finance Plastic Surgery Bent Finger Causes Living With Psoriasis? Benefits of CBD 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 Living With Ankylosing Spondylitis Live Better With Psoriatic Disease Types of B-Cell Therapy for MS Living Better With T2 Diabetes Why Prostate Cancer Spreads Getting the Care You Need for MS Where Breast Cancer Spreads 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.