This content is from WebMD not intended to be a substitute for professional medical advice, diagnosis, or treatment.

This content is from WebMD not intended to be a substitute for professional medical advice, diagnosis, or treatment.

ADHD affects an estimated 3% to 5% of children and adults in the U.S. Get information here about attention deficit hyperactivity disorder, including its causes, diagnosis, and promising treatments -- from medication to behavioral therapy.

Allergies affect nearly 20% of Americans. Here you''ll find in-depth articles about allergy treatments, triggers, and prevention.

Alzheimer''s disease affects an estimated 1 in 10 people over age 65. Find in-depth information about its causes, symptoms, diagnosis, and promising treatments. Plus, find caregiver support here.

Asthma affects an estimated 17 million people in the U.S. alone. Find in-depth information on asthma treatments, triggers, and prevention. Plus, find support for parents caring for children with asthma.

Back pain affects 80% of Americans at some time in their lives. Here you''ll find in-depth articles about the causes of back pain and back pain relief - from exercises to medical treatments.

Breast cancer is 90% curable when caught early. Get in-depth information here about breast cancer, its symptoms, stages, and promising treatments. Plus, meet breast cancer survivors in our online support groups.

Cancer is diagnosed in more than 1 million people every year in the U.S. alone. Find in-depth articles here about cancer, its causes, symptoms, prevention, and promising treatments. Plus, meet cancer survivors in our online support groups.

Colorectal cancer is diagnosed in more than 130,000 people each year in the U.S. alone. Get in-depth information here on colorectal cancer -- or colon cancer -- including articles on causes, symptoms, prevention, and promising treatments.

Your smile says a lot about you. Whether you''re considering cosmetic dentistry, need answers to a dental problem, or just want to improve your daily dental care, you''ll find the information you need to keep your smile in top shape.

Diabetes affects an estimated 17 million Americans, and the number rises each year. Find in-depth information here about diabetes prevention, diet, treatments, and research. Plus, find daily support and nutritional tips in our online message boards.

Considering LASIK? Diagnosed with glaucoma or cataracts? Ready for a new pair of eyeglasses or contact lenses? Find the information you need on eyes and eye disorders to help you see your best.

Get information on what exercises and fitness techniques you need to stay healthy and work out right.

Get the information on men''s health issues that you need to stay strong and fit, avoid stress, and maintain a healthy sex life.

Get information on senior living, exercise for seniors, staying active, and enjoying this time of life.

Get the information on women''s health issues that you need to avoid stress and stay active and vibrant.

HIV/AIDS infects an estimated 5 million people worldwide each year. Up to 950,000 people live with HIV in the U.S. alone. Find articles here about HIV/AIDS treatment, transmission, and prevention, as well as information on safe sex and daily support.

Smoking is one of the most addictive habits, yet nearly half of Americans who once smoked eventually quit. To help you quit smoking, you''ll find in-depth information here on successful smoking cessation techniques, nicotine patches, and other products.

Women''s health is an increasingly important field of medicine. Here you''ll find in-depth articles on women''s health issues such as chronic pelvic pain, fibroids, menstrual problems, and menopause.