Ongoing pain in the pelvis can be a symptom of another disease or a condition in its own right. Learn how it's diagnosed and treated.
Disease
Chronic sinusitis
Read about possible causes of lasting sinus troubles, treatments and how to prevent these problems.
Disease
Chronic traumatic encephalopathy
This brain disease is likely caused by repeated concussions, but this condition isn't well understood.
Disease
Churg-Strauss syndrome
This rare blood vessel disease may cause breathing trouble, face pain and a persistent runny nose. Medications can help.
Disease
Cirrhosis
This advanced stage of liver damage often shows no symptoms until it's quite serious. Find out about symptoms and treatment of this life-threatening liver condition.
Disease
Claudication
Too little blood flow to the legs and arms can cause pain, especially during exercise. Learn more about diagnosing and treating intermittent claudication.
Disease
Cleft lip and cleft palate
When an unborn baby's face and mouth are developing, openings or splits in the upper lip or roof of the mouth may not close fully. Surgery can fix this.
Disease
Clubfoot
This is when a baby is born with a foot fixed in a turned position. Without treatment, a child with a clubfoot may walk on the side or top of the foot.
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
Coarctation of the aorta
This heart condition is usually present at birth. It's treatable but requires lifelong health checkups. Learn about the causes and treatment.
Disease
Cold sore
Learn more about the causes, symptoms, treatment and prevention of this common lip sore caused by the herpes simplex virus type 1 (HSV-1).
Disease
Cold urticaria
Cold causes this allergic skin response. It most often affects young adults, with symptoms ranging from mild to serious.