Why is pink eye so contagious?
The answer to this question depends on two factors: the microbes that cause the infection and the way they spread from person to person.
The answer to this question depends on two factors: the microbes that cause the infection and the way they spread from person to person.
A number of medical conditions can cause an allergic reaction to ultraviolet light from the sun.
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Inflammation is the body's response to injury or infection. It works to help heal wounds, but it can also play a role in chronic disease.
There are a number of possible reasons for bleeding between periods, including hormonal changes, infections and certain medical conditions.
Redheads are said to experience pain differently than other people and require higher doses of pain medications, depending on the drug used. Why?
The Brazilian wandering spider, also called the banana spider, is one of the planet's most venomous spiders.
New scientific techniques are helping us reconstruct people from the past in uncanny detail.
A buildup of dental plaque breaks down tooth enamel, leading to tooth decay, gum disease and other oral health conditions.
Having a stuffy nose often comes with pain and tenderness around your cheeks, eyes or forehead. But what do blocked sinuses look like inside your head?
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Coming down with a cold or the flu can muffle your hearing, but why?
Heart murmurs are extra, unusual sounds heard during a heartbeat — but why do they happen?
After you've eaten beets, your poop and urine can take on a shocking red or pink color — but why?
The speed at which food moves through the digestive tract depends on many factors.