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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.

Most insect bites are harmless and cause only minor swelling or itching. But if you're allergic to insects, such as wasps or bees, a sting can cause a life-threatening allergic reaction. The venom (poison) from scorpions and certain spiders can also be deadly, although this is rare. Knowing when to get emergency care could save your life.

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.

You had a surgical procedure called rhinoplasty, which changes the structure and shape of the nose. Here's what you need to know following this procedure.

You are going home with a central line in place. This line carries medicine, fluids, or nutrition into your body. To keep the line clean and working well, it must be flushed regularly. Here's what you need to know.

You are going home with a central line. This is a tube put in a vein that leads to your heart. It provides medicine during your treatment. Because a central line has a high infection risk, you must take extra care. This sheet will help you remember what to do at home.