These small, painful sores form inside the mouth. They have a white or yellow center with a red border. The pain may make it hard to eat or talk.
Disease
Coma
Learn what can cause this state of prolonged loss of consciousness. While a coma rarely lasts longer than a few weeks, some people never wake from one.
Disease
Acute kidney injury
Learn what happens when the kidneys suddenly stop working, what causes this condition and how it's treated.
Disease
Autoimmune hepatitis
This type of hepatitis happens when the immune system attacks the liver with destructive antibodies. Immune-suppressing medicine is the main treatment.
Disease
Primary progressive aphasia
Find out more about this type of dementia that affects the speech and language areas of the brain.
Disease
Viral hemorrhagic fevers
Learn about the symptoms, treatment and prevention of these sometimes deadly diseases.
Disease
Gastrointestinal bleeding
Bleeding from anywhere in your digestive tract is a symptom of a disorder. Bleeding can be hidden or obvious, slight or severe.
Disease
Tension headache
These common headaches can be triggered by stress. Healthy habits and medicines can help manage them.
Disease
Common cold
This common illness of the nose and throat causes a stuffy or runny nose, sore throat, and cough.
Disease
Eye floaters
Many people over age 50 experience eye floaters. Learn more about this common problem, including causes, other risk factors and treatment options.
Disease
Medication overuse headaches
Using medicines that ease headache pain too often can start causing headaches. Learn about prevention and treatment.
Disease
Gangrene
A severe bacterial infection or lack of blood flow can cause body tissue to die. Know the warning signs and symptoms of this life-threatening condition.