- Calculus of the kidney
- Cancer of the larynx
- Candidiasis
- Cardiogenic shock
- Cellulitis
- Cerebral palsy
- Cervical cancer
- Cervicitis
- Chancroid
- Chlamydial infection
- Chlamydia psittaci
- Cholelithiasis
- Cholera
- Chromomycosis and Phaeomycotic abscess
- Chronic
- Chronic ischaemic heart disease
- Chronic laryngitis
- Chronic obstructive pulmonary disease
- Chronic sinusitis
- Chronic viral hepatitis
- Coccididoidomycosis
- Coeliac disease
- Complications of abortion
- Congenital ectropion
- Congenital entropion
- Congenital hypertrophic pyloric stenosis
- Congenital ptosis
- Congestive heart failure
- Conjunctivitis
- Constipation
- Convulsions/Fits
- Corneal ulcer
- Coronary thrombosis
- Corpus luteum cyst
- Cracked heels
- Crohn's disease
- Cryptococcosis
- C/S
- Cutaneous abscess
- Cysticersosis
- Cystic fibrosis
- Cystic fibrosis with pulmonary manifestations
- Cystocele
- Cyst of bartholin's gland
- Cytomegaloviral disease