- Sarcoidosis of lymph nodes
- Scabies
- Scarlet fever
- Schistosomiasis
- Schizophrenia
- Scoliosis
- Seborrhoeic dermatitis
- Secondary hypertension
- Senile cataract
- Sequelae of poliomyelitis
- Sequelae of tuberculosis
- Sex
- Sexual aversion and lack of sexual enjoyment
- Sexual dysfunction, not caused by organic disorder or disease
- Sexually transmitted infections - General
- Sexual relationship disorder
- Shigellosis
- Shock
- Sickle cell disorders
- Sinusitis - general
- Skin
- Sleep apnoea
- Smallpox
- Snake bite
- Social phobia
- Somatization disorder
- Spontaneous abortion
- Spontaneous vaginal (normal) delivery (SVD)
- Spotted fever (tick borne)
- Sprain
- Stomach cancer
- Strangulated hernia
- Streptococcal septicaemia
- Stroke
- Strongyloidiasis
- Subinvolution of uterus
- Sunburn
- Surgery and Rehabilitation
- Syphilis - congenital, early, latent, late
- Systemic lupus erythematosus