Bone cancer most commonly affects the long bones in the arms and legs. Some types happen mostly in children, while others affect mostly adults.
Disease
Breast cancer
Learn about this common cancer, including information on prevention, symptoms, diagnosis and treatment.
Disease
Breast cysts
A firm, round lump in breast tissue could be a fluid-filled cyst. Typically not cancerous, breast cysts often need no treatment.
Disease
Broken collarbone
This common injury is usually the result of falling, playing sports or being in a traffic accident.
Disease
C. difficile infection
Learn more about this diarrhea-causing infection that often occurs after antibiotic use. Many, but not all, people who get it are in health care facilities.
Disease
COPD
This ongoing lung disease limits airflow into and out of the lungs. This results in trouble breathing, cough with mucus and wheezing.
Disease
CSF leak (Cerebrospinal fluid leak)
Cerebrospinal fluid leaks may start in the brain or spine, causing headaches, dizziness and other symptoms.
Disease
Calciphylaxis
Learn more about this uncommon condition that affects small blood vessels and skin tissues, causing painful skin ulcers.
Disease
Cancer
Find out the basics about cancer, including symptoms, causes and treatments. Learn steps you can take to prevent cancer.
Disease
Canker sore
Canker sore — Learn about the causes, treatment and prevention of this painful mouth sore.
Disease
Carbon monoxide poisoning
Learn how to prevent poisoning with this gas that has no color, odor or taste.
Disease
Carcinoid syndrome
Find out about skin flushing and other symptoms of this syndrome caused by a rare cancer called a carcinoid tumor.