- campylobacteriosis
- cancer
- cancer lymphoma
- cancerous tumors
- carcinoma
- cardiac arrest
- cardiac arrhythmia
- cardiac arrhythmias
- cardiac surgery
- cardiovascular disease
- carotid arterial disease
- cataracts
- celiac disease
- cervical cancer
- chagas disease
- charcot-marie-tooth disease
- chemotherapy regimens
- childhood cancer
- childhood obesity
- chlamydia
- chlamydia trachomatis
- cholera
- chromosomal abnormalities
- chronic alcoholism
- chronic asthma
- chronic autoimmune disease
- chronic bronchitis
- chronic diseases
- chronic fatigue syndrome
- chronic hbv infection
- chronic heart failure
- chronic inflammatory disease
- chronic kidney disease
- chronic liver disease
- chronic low back pain
- chronic lymphocytic leukemia
- chronic myelogenous leukemia
- chronic myeloid leukemia
- chronic obstructive pulmonary disease
- chronic pain
- chronic sinusitis
- chronic wasting disease
- cirrhosis
- coarctation of the aorta
- cognitive dysfunction
- colitis
- colon cancer
- colon polyps
- colorectal cancer
- congenital adrenal hyperplasia
- congenital heart abnormalities
- congenital heart defect
- congenital heart disease
- congenital hypothyroidism
- congestive heart failure
- constipation
- conversion disorder
- corneal ulcers
- coronary artery disease
- coronary artery stenosis
- coronary disease
- coronary heart disease
- creutzfeldt jakob disease
- crohn's disease
- cushing disease
- cystic fibrosis
