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Chronic Obstructive Pulmonary Disease
Chronic Obstructive Pulmonary Disease (COPD) is a long-term obstructive chronic lung disease that makes it harder to move air in and out…
Chronic Occlusion
Chronic occlusion is a blockage in a blood vessel that has been present for several months or longer. On this page, the…
Chronic Pain
Chronic pain is pain that lasts beyond the expected healing period, usually for three months or longer, or pain that keeps returning.…
Chronic Rhinosinusitis
Chronic rhinosinusitis is ongoing inflammation of the lining of the nose and sinuses. Symptoms generally last for at least 12 weeks, although…
Chronic Total Occlusion Of Coronary Artery
Chronic total occlusion of a coronary artery is a complete blockage that has been present for at least several months. It usually…
Chronic Urticaria
Chronic urticaria is a condition that causes recurring raised, itchy welts called hives. Some people also develop deeper swelling, known as angioedema,…
Cidp
Chronic inflammatory demyelinating polyradiculoneuropathy, or CIDP, is a neurological condition in which the immune system mistakenly damages the myelin covering of peripheral…
Clostridioides Difficile Infection
Clostridioides difficile infection is a bacterial infection of the colon that can cause diarrhea and inflammation. The bacteria may overgrow when antibiotics…
Clostridium Perfringens Food Poisoning
Clostridium perfringens food poisoning is an illness caused by Clostridium perfringens, also called Clostridium welchii. This spore-forming bacterium can cause illness when…
Cogwheel Rigidity
Cogwheel rigidity is increased resistance when a clinician gently moves a relaxed limb, such as the wrist or elbow. Instead of moving…
Cold Sores
Cold sores are recurring, contagious blisters usually caused by herpes simplex virus type 1 (HSV-1). They often appear on or around the…
Colon Cancer
Colon cancer is a cancer that starts in the large intestine, also called the colon. It is different from rectal cancer, which…
Colorectal Cancer
Colorectal cancer is cancer that begins in the colon or rectum, which are parts of the large intestine. It develops when abnormal…
Common Warts
Common warts are noncancerous, rough skin growths caused by certain types of human papillomavirus (HPV). They usually appear on the fingers, hands,…
Congenital Adrenal Hyperplasia
Congenital adrenal hyperplasia (CAH) is a group of inherited conditions that affect how the adrenal glands make hormones. Most cases involve a…
Congenital Amegakaryocytic Thrombocytopenia
Congenital amegakaryocytic thrombocytopenia is a rare inherited blood disorder in which the bone marrow produces too few megakaryocytes, the cells that make…
Congenital Disease
Congenital disease refers to a condition that is present at birth. Some conditions are inherited through changes in genes or chromosomes, while…
Congenital Heart Defect
A congenital heart defect is a structural problem in the heart that is present at birth. It can affect the heart chambers,…
Congenital Hydrocephalus
Congenital hydrocephalus is a condition in which too much cerebrospinal fluid (CSF) collects in or around a baby's brain. It is present…
Congenital Nevi
Congenital nevi are growths of pigment-producing skin cells that are present at birth or noticed soon afterward. They may be small or…
Contact Dermatitis
Contact dermatitis is an inflammatory skin reaction that develops after the skin touches an irritant or an allergen. Irritant contact dermatitis results…
Coolsculpting
CoolSculpting is a nonsurgical body-contouring treatment that uses cryolipolysis, or controlled cooling, to target fat cells beneath the skin. An applicator gently…
Coronary Artery Aneurysm
A coronary artery aneurysm is an area of abnormal widening or bulging in a blood vessel that supplies the heart. Unlike a…
Coronary Artery Disease
Coronary artery disease is a type of heart disease in which plaque builds up inside the coronary arteries, the blood vessels that…
