- Taenia saginata and taenia solium
- Talipes
- Tamiflu
- Tapeworm infections
- Tau protein test
- Tay-Sachs disease
- Teething
- Tendonitis
- Tennis elbow
- Tenosynovitis
- Termination of pregnancy
- Testicles, undescended
- Testicular cancer
- Testicular feminisation syndrome
- Testicular lumps, benign
- Tetanus
- Thalassaemia
- Therapeutic endoscopy of the stomach
- Threadworms
- Thrombosis
- Thrush
- Thrush, men
- Thrush, oral - adults
- Thrush, oral - babies
- Thyroid cancer
- Thyroid, over-active
- Thyroid, under-active
- TIBC test
- Tick-borne encephalitis
- Tics
- Tietze's syndrome
- Tinea pedis
- Tinnitus
- Tonsillitis
- Tooth abscess
- Tooth decay
- Toothache
- Total protein test
- Tourette's syndrome
- Toxic shock syndrome
- Toxocariasis
- Toxoplasmosis
- TPMT test
- Tracheostomy
- Trachoma
- Traction
- Tranquillisers
- Transient ischaemic attack
- Travel health
- Travel immunisation
- Travel sickness
- Traveller's diarrhoea
- Treatment options
- Tremor (essential)
- Trichomonas vaginalis
- Trichomoniasis
- Trigger finger
- Tuberculosis
- Tuberous sclerosis
- Turner syndrome
- TURP
- Typhoid fever