- Tachycardia
- Taeniasis
- Testicle cancer
- Tetanus Neonatorum (newborn tetanus)
- Thalassaemia
- Thyroid+other endocrine glands
- Thyrotoxicosis (hyperthyroidism)
- Thyrotoxicosis with toxic diffuse goiter (Grave's disease)
- Tinea barbae
- Tinea capitis
- Tinea corporis
- Tinea cruris
- Tinea imbricata
- Tinea manuum
- Tinea nigra
- Tinea pedis
- Tinea unguium
- Tinea versicolor
- Tonsillitis - general
- Toxoplasmosis
- Trachoma
- Traumatic cataract
- Traumatic pneumothorax
- Trichinellosis
- Trichomoniasis
- Trichuriasis
- Tricuspid insufficiency
- Tricuspid stenosis
- Trigger finger
- Tuberculosis of other organs e.g. bones, joints, genitourinary system, peripheral lymphadenopathy, abdominal TB, adrenal glands, skin, eye, ear etc
- Tuberculosis of the nervous system
- Tularaemia
- Tungiasis (sandflea infestation, jiggers)
- Typhoid fever & Paratyphoid fevers