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Retinopathy of prematurity is an eye problem that happens to premature babies. The retina lines the back of the eye. It receives light as it comes through the pupil. From there, the optic nerve sends signals to the brain. Retinopathy of prematurity is a problem of the blood vessels of the retina.

Generalized anxiety disorder (GAD) is a mental health problem. A child with GAD has a lot of worry and fear that seems to have no real cause.

A food allergy is when your body has a bad immune reaction to a certain food. This is different than a food intolerance, which does not affect the immune system. Read on to learn more.

Major health concerns have been raised about e-cigarettes. Here's what you need to know.

Simply lacing your shoes or sneakers correctly along with choosing a shoe that fits your foot correctly, can add comfort to your stride and prevent foot injuries.

What happens when your healthcare provider taps on your knee with a rubber mallet? Your leg kicks forward, seemingly on its own. And in a sense, your leg has a mind of its own — in your spinal cord.

Playing tennis or racquetball is a fun way to boost the intensity of your fitness program, as well as improve your balance, strength, and agility.

Primary ovarian insufficiency, or POI, occurs when the ovaries stop working as they should work, before the age of 40. With POI, the ovary does not release an egg each month. Learn about the symptoms and treatment of this condition.

For many people, the extreme tiredness of the first trimester is quite a surprise. And it's an especially hard transition for those who are normally go-getters with lots of energy. Learn more about what causes this fatigue--and what to do to feel better.