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 ...

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 ...

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 ...

Brief psychotic disorder is a mental health condition in which psychotic symptoms come on suddenly but last only for a short time — less than one month. After that, people usually recover completely.

Mosquitoes are small, flying insects that are common to the U.S. They have a long, needle-like mouth part called a proboscis that breaks skin and sucks blood from people and animals. Some mosquitoes ...

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 ...

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 ...

The Zika virus arrived in the United States in 2016, with local transmission reported in and around Miami, FL, and Brownsville, TX. The CDC continues to issue travel warnings for pregnant women in ...

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 ...

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, ...