A man may ejaculate 40 million to 150 million sperm, which start swimming upstream toward the fallopian tubes on their mission to fertilize an egg. Fast-swimming sperm can reach the egg in a half an ...

A few decades ago, most people had never heard of autism. Now, you probably hear about it regularly. Autism is short for autism spectrum disorder (ASD). It's a group of neurodevelopmental (or brain ...

Deep vein thrombosis (DVT), which is a blood clot that develops in a deep vein, can cause pain, warmth, swelling, or redness (often in your calf muscle) that doesn’t go away. A DVT can be hard to ...

The amount of sleep a person needs depends on many factors, including age. Xywav is the only liquid medicine approved to treat both narcolepsy and idiopathic hypersomnia. which is safe and effective ...

When you scrape your knee, break a bone, or cut yourself, the body is able to heal itself. But that’s not the case with certain conditions, like diabetes or heart disease. Regenerative medicine, a ...

Propofol is a strong anesthetic that's used for surgery, some medical exams, and for sedation for people on ventilators -- never as a sleep aid. It's given by IV and should only be administered by a ...

Cytolytic vaginosis, which is sometimes called "lactobacillus overgrowth syndrome" or "Doderlein's cytolysis," is thought to happen when too much of a certain type of bacteria grows in your vagina.

Your toe is red, swollen, and sore. Could it be infected? Toe infections are common -- especially in people with diabetes or a weakened immune system. Knowing what caused your infection can help you ...

If you're exhausted, cynical, and feeling useless, it's no wonder that depression can set in. Research shows burnout is mainly a job thing, while depression is a whole-life thing that can include your ...

Your body needs protein to stay healthy and work the way it should. More than 10,000 types are found in everything from your organs to your muscles and tissues to your bones, skin, and hair. Protein ...

Low testosterone can get you down -- a little or to the point sadness or depression. To help, take steps to ease stress. Try meditation, yoga, exercise, or massage. Some men really see a change in ...

This “good” cholesterol, called HDL, seems to go up in people who have three or more eggs a day. Of course, LDL, the “bad” type, goes up, too. But the individual pieces of each get bigger. That makes ...