• Salivary gland stones

• Sarcoidosis

• Scabies

• Scarlet fever

• Scars

• Schistosomiasis (bilharzia)

• Sciatica

• Scleroderma

• Scoliosis

• Scurvy

• Sepsis

• Septic arthritis

• Sexually transmitted infections (STIs)

• Shin splints

• Shingles

• Shortness of breath

• Short-sightedness (myopia)

• Shoulder impingement

• Shoulder pain

• Sick building syndrome

• Sickle cell disease

• Silicosis

• Sinusitis (sinus infection)

• Sjögren's syndrome

• Skin abscess

• Skin cancer (non-melanoma)

• Skin cyst

• Skin tags

• Slapped cheek syndrome

• Sleep apnoea

• Sleep paralysis

• Sleepwalking

• Slipped disc

• Small bowel transplant

• Smelly feet

• Smelly urine

• Snake bites

• Snoring

• Soft tissue sarcomas

• Soiling (child pooing their pants)

• Sore or dry lips

• Sore or white tongue

• Sore throat

• Spina bifida

• Spinal muscular atrophy

• Spirometry

• Spleen problems and spleen removal

• Spondylolisthesis

• Sprains and strains

• Squint

• Stammering

• Staph infection

• Statins

• Stem cell and bone marrow transplants

• Steroid inhalers

• Steroid injections

• Steroid nasal sprays

• Steroid tablets

• Steroids

• Stevens-Johnson syndrome

• Stillbirth

• Stomach ache

• Stomach cancer

• Stomach ulcer

• Stop smoking treatments

• Stopped or missed periods

• Strep A

• Stretch marks

• Stroke

• Stye

• Subarachnoid haemorrhage

• Subdural haematoma

• Sudden confusion (delirium)

• Sudden infant death syndrome (SIDS)

• Sunburn

• Supraventricular tachycardia (SVT)

• Swollen ankles, feet and legs (oedema)

• Swollen arms and hands (oedema)

• Swollen glands

• Syphilis