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Disease

Cluster headache

These painful headaches cause severe pain on one side of the head and tend to occur in bouts called cluster periods.
Disease

Ulcerative colitis

This type of inflammatory bowel disease causes swelling and sores in the digestive tract. Learn more about symptoms, treatment and managing flares.
Disease

Immune thrombocytopenia (ITP)

Caused by low levels of platelets, symptoms may include purple bruises called purpura, as well as tiny reddish-purple dots that look like a rash.
Disease

Patellofemoral pain syndrome

This pain near the front of the knee is more common in people who run and who play sports that involve running and jumping.
Disease

Pericarditis

Inflammation of the tissue surrounding the heart can cause sharp chest pain and other symptoms. Know how pericarditis is diagnosed and treated.
Disease

Multiple endocrine neoplasia, type 2 (MEN 2)

Learn about this rare condition that causes tumors and overproduction of hormones.
Disease

Amyotrophic lateral sclerosis (ALS)

This nervous system disease, also known as Lou Gehrig's disease, destroys nerve cells and gets worse over time.
Disease

Iron deficiency anemia

Not getting enough iron can lead to this condition, which can cause tiredness and shortness of breath.
Disease

Valley fever

Learn about symptoms and treatment for this lung infection caused by fungi found in the soil of desert regions.
Disease

Exercise headaches

Learn about the causes and treatments of this puzzling disorder.
Disease

Listeria infection

This illness is caused by bacteria that spreads in food. It can be very serious for some people. Learn about symptoms, treatment and tips to prevent it.
Disease

Metatarsalgia

With this condition, the ball of the foot becomes painful and irritated. Learn about the causes, treatments and prevention of this injury.

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