Melatonin is a hormone made by the pineal gland, which is located in the middle of your brain. Melatonin encourages good, healthy sleep. Your melatonin levels naturally go up at night, a few hours ...

To tell if you’re dehydrated, you can do the “pinch test.” Pinch a bit of skin on your arm between your thumb and forefinger. If you’re well hydrated, it should go back to its original position a ...

The active ingredient in peppermint is menthol. Some small studies show it can lessen the pain of migraine headaches. It may also reduce other symptoms like light sensitivity, nausea, and vomiting. A ...

Your doctor might call it hypoglycemia. It means there’s not enough fuel, or glucose, in your blood, and it can make you feel tired, weak, or dizzy. It can happen if you haven’t eaten in more than a ...

This includes yoga, push-ups, pull-ups, weight training, and other activities that can help you add weight. They do burn calories, but that can make you hungrier so you eat more. Talk to your doctor ...

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A tan may look nice, but that golden color is due to an injury to the top layer of your skin. When you soak up the sun's ultraviolet (UV) rays, it speeds up the aging of your skin and raises your risk ...

Medically Reviewed by Shruthi N, MD on April 24, 2026 ...

Sciatic nerves go from your lower back into your legs. When something presses on them, like a slipped disk or a bone spur, you get sciatica. You might have a burning sensation, numbness, weakness, or ...

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.

Years ago, parents often gave their children baby aspirin for fevers and illness. Now that doctors know more about Reye's syndrome -- a rare but serious condition that affects the brain, kidneys, and ...

It’s an especially important time to get enough iodine. Too little could affect your baby’s growth and brain development. That’s why pregnant women need about 50% more iodine than other adults. You’re ...