COVID-19 is a respiratory condition caused by a coronavirus. Some people are infected but don’t notice any COVID-19 symptoms (doctors call that being asymptomatic). Most people have mild symptoms and ...

Once a virus infects your body, it can destroy healthy cells and make multiple copies of itself. The virus causing COVID mainly attacks the cells lining your airways. This makes it hard for you to ...

Alzheimer's is a brain disease that causes a decline in your memory, thinking, reasoning, and organization skills. It eventually impairs your ability to do daily basic tasks. The symptoms of Alzheimer ...

Are HIV Symptoms the Same in Women and Men? The symptoms of HIV are mostly the same for both sexes. But there can be some differences, especially if the infection is untreated. Women and people ...

Many mental health and medical conditions have symptoms similar to depression -- like fatigue and sleep problems -- so you may think you have depression when really it’s something else. Here are the ...

ALS (amyotrophic lateral sclerosis), also known as Lou Gehrig's disease, affects the nerves that control your voluntary muscles. Those are muscles you use for actions such as moving your arms and legs ...

Stress is your body's response to a challenging or demanding situation. When you feel stressed, your body releases certain hormones. Your hormones are chemical signals your body uses to tell your body ...

Cellulite is fat that collects beneath the skin and makes it look lumpy or dimpled. Unlike lipedema, cellulite is only a cosmetic condition, and it doesn’t cause pain. Lipedema vs. lymphedema Lipedema ...

Serotonin syndrome can happen when your body has too much of a chemical called serotonin, usually because of a medication or a combination of medications. What is serotonin? Your body makes serotonin, ...