- Caesarean section
- Café-au-lait spots
- Cancer, anal
- Cancer, bile duct
- Cancer, bladder
- Cancer, bone (sarcoma)
- Cancer, brain
- Cancer, breast (female)
- Cancer, breast (male)
- Cancer, cervical
- Cancer, colon, rectum or bowel
- Cancer, colorectal
- Cancer, eyelid
- Cancer, fallopian tube
- Cancer, gallbladder
- Cancer, head and neck
- Cancer, kidney
- Cancer, laryngeal (larynx)
- Cancer, liver
- Cancer, lung
- Cancer, mouth
- Cancer, nasopharyngeal
- Cancer, nose and sinus
- Cancer, oesophageal
- Cancer, ovarian
- Cancer, pancreatic
- Cancer, penile
- Cancer, primary peritoneal (PPC)
- Cancer, prostate
- Cancer, salivary gland
- Cancer, skin (malignant melanoma)
- Cancer, skin (non-melanoma)
- Cancer, soft tissue (sarcoma)
- Cancer, stomach
- Cancer, testicular
- Cancer, thyroid
- Cancer, uterine (uterus)
- Cancer, vaginal
- Cancer, vulval
- Cancer, womb
- Candidiasis, men
- Candidiasis, oral (adults)
- Candidiasis, oral (babies)
- Candidiasis (thrush)
- Carbon monoxide poisoning
- Carcinoid
- Cardiac catheterisation and coronary angiography
- Cardiovascular disease
- Carotid endarterectomy
- Carpal tunnel syndrome
- Cartilage damage
- Cataract surgery
- Cataracts
- Cataracts, childhood
- Catarrh
- Cavernoma
- Cavernous sinus thrombosis
- CBD
- CBT
- Cellulitis
- Cerebellar ataxia
- Cerebral palsy
- Cerebrovascular disease
- Cervical cancer
- Cervical spondylosis
- CFS
- Chalazion
- Chapped lips
- Charcot-Marie-Tooth disease
- Chemotherapy
- Chest infection
- Chest pain
- Chicken skin
- Chickenpox
- Chilblains
- Chiropractic
- Chlamydia
- Chloride test
- cholangiocarcinoma
- Cholecystectomy
- Cholecystitis, acute
- Cholera
- Cholesterol, high
- Cholesterol-lowering medicines, statins
- Chorionic villus sampling
- Chronic fatigue syndrome
- Chronic kidney disease
- Chronic lymphocytic leukaemia
- Chronic myeloid leukaemia
- Chronic myelomonocytic leukaemia
- Chronic obstructive pulmonary disease (COPD)
- Circumcision
- Cirrhosis
- CJD
- Cleft lip and palate
- Clinical trials and research
- Clopidogrel
- Clostridium difficile
- Club foot
- Cluster headaches
- CMV
- Coated tongue
- Coccydinia
- Coeliac disease
- Cognitive behavioural therapy
- Coil
- Cold
- Cold sore
- Colic
- Collarbone injury
- Colon cancer
- Colorectal cancer
- Colorectal cancer
- Colostomy
- Colour vision deficiency
- Colposcopy
- Coma
- Combined contraceptive pill
- Community acquired pneumonia
- Complex Regional Pain Syndrome
- Computerised tomography
- Concussion
- Condoms (male and female)
- Congenital cataracts
- Congenital heart disease
- Congestive heart failure
- Conjunctivitis, allergic
- Conjunctivitis, infective
- Consent to treatment
- Constipation
- Contact dermatitis
- Contraception
- Contraceptive implants and injections
- Contraceptive patch
- Contraceptive pill, combined
- Contraceptive pill, emergency
- Contraceptive pill, male
- Contraceptive pill progestogen only
- Cornea transplant
- Corns and calluses
- Coronary angiography
- Coronary angioplasty
- Coronary artery bypass
- Coronary heart disease
- Cortical death
- Corticobasal degeneration
- Corticosteroid preparations (topical)
- Corticosteroids
- Cosmetic surgery
- Cot death
- Cough
- Coughing up blood
- Counselling
- Crabs
- Cradle cap
- Cramps, leg
- Craniosynostosis
- Creutzfeldt-Jakob disease
- Crohn's disease
- Croup
- CRPS
- Crying baby
- Cryptorchidism
- CT scan
- Cushing's syndrome
- Cuts and grazes
- CVS
- Cystic fibrosis
- Cystitis
- Cystoscopy
- Cytomegalovirus