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A break in the skin is an open door, inviting dirt and germs to enter your body and cause infection. Learn how to prevent infection with correct first-aid care.

A clear lens in the eye focuses light. This lets the eye see images sharply. With age, the lens slowly becomes cloudy. The cloudy lens is a cataract. A cataract scatters light and makes it hard for the eye to focus.

Some chemicals cause burns. Others may be absorbed through skin or lungs, causing hidden damage.

Chlamydia is an infection spread through sex. It's common among young adults. Chlamydia is easy to treat, but you need the right medicine. You must get treated by a health care provider.

Chlamydia infection is a very common sexually transmitted infection (STI). Because most people do not have symptoms, chlamydia may not be noticed until it causes severe problems. Left untreated, this STI can cause people to become sterile.

Cancer starts when cells in the body change (mutate) and grow out of control. These cells can form lumps of tissue called tumors. Cancer that starts in the cells of the colon is called colon cancer. Cancer that starts in the cells that make up the rectum is called rectal cancer. These cancers are a lot alike, so they're sometimes just called colorectal cancer.

While a slight cut or scratch to your cornea is minor, some eye injuries can be very serious. Learn when you should go to the emergency room, and what treatment options to expect.

Your toddler has a harsh cough that gets worse in the evening. Now they have woken up gasping for air. Chances are your child has croup. Read on to learn how to care for your child.

Embolization is a procedure to block a blood vessel. It is done to stop severe bleeding. Or it is done to stop blood flow to a part of the body. A catheter (thin, flexible tube) is put into a blood vessel through a small incision. It is often done by a doctor called an interventional radiologist.