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.