The bacteria Bordetella pertussis causes whooping cough. It's spread when an infected person coughs or sneezes, spraying germ-laden droplets into...

CausesA runny nose, also known as rhinorrhea, is a fluid discharge from the nose. This can be clear or colored...

When something interferes with the optic nerve, it can affect your vision. It can happen if you have a tumor...

Wilms tumor, also called nephroblastoma, is the most common type of kidney cancer in children. It mostly affects boys and...

Gum recession is a serious dental problem that exposes tooth roots to bacteria and makes teeth appear longer. It can...

During a typical absence seizure, a person (usually a child) stops what they're doing and appears to be daydreaming. The...

Necrosis is the death of tissue in the body. It's caused by factors like insufficient oxygen, infection and trauma. Symptoms...

Clostridial gas gangrene, also called myonecrosis, is caused by bacteria such as Clostridium perfringens and Clostridium septicum. It typically develops...

Gangrene occurs when the skin changes color. It starts as red or purple, then bluish gray and eventually black. The...

Emphysema is one of the conditions that makes up chronic obstructive pulmonary disease (COPD). Smoking and exposure to secondhand smoke...