SAD

Salivary stones

Salmonella infection

Sarcoidosis

Sarcoma, Ewing

Sarcoma, Kaposi's

Sarcoma, soft tissue

SARS

Scabies

Scarlet fever

Scars

Schistosomiasis

Schizophrenia

Sciatica

Scleroderma

Scoliosis

Scrub typhus

Scurvy

Sea creature stings

Seasonal allergic rhinitis

Seasonal flu

Selective mutism

Selective serotonin reuptake inhibitors

Self-harm

Semen, bloody

Sepsis

Septic arthritis

Septic shock

Sex change

Sexually transmitted infections (STIs)

Shigella

Shin splints

Shingles

Short stature

Short-sightedness

Shortness of breath

Shoulder dislocation

Shoulder pain

Shoulder tendon, trapped

Shyness (social anxiety disorder)

Sick building syndrome

Sickle cell anaemia

Sickness in children and babies

SIDS

Silicosis

Singultus

Sinus headache

Sinusitis

Sjogren's syndrome

Skin cancer (melanoma)

Skin cancer (non-melanoma)

Skin cyst

Skin rashes in babies

Skin rashes in children

Skin tags

Skin, blue

Skin-picking habit

Slapped cheek syndrome

Sleep apnoea

Sleep paralysis

Sleepiness in the day (severe and unexplained)

Sleepwalking

Slipped disc

Small bowel transplant

Smear test

Smell sense, loss of

Smell, imaginary (phantom smell)

Smelly urine

Smoking treatments

Snake bites

Snoring

Soiling of pants in children (encopresis)

Solar keratoses

Somatisation disorder

Sonodynamic therapy (SDT)

Sore lips

Sore throat

Sore tongue

Sound intolerance (hyperacusis)

Spastic paraplegia, hereditary

Sperm count, low

Spider bite

Spina bifida

Spinal muscular atrophy

Spirometry

Spleen disorders and splenectomy

Spondylolisthesis

Sports injuries

Sprains and strains

Squamous cell carcinoma in situ

Squint

Stammering

Staphylococcal infections

Statins

Steatosis

Stein-Leventhal syndrome

Stem cell transplant

Stent insertion

Steroid inhalers

Steroid injections

Steroid medication

Steroid misuse

Steroid nasal sprays

Steroid tablets

Stevens-Johnson syndrome

Stiff neck

Stillbirth

Stoma

Stomach ache

Stomach cancer

Stomach removal surgery

Stomach ulcer

Stopped or missed periods

Strawberry mark

Streptococcal infections

Stress incontinence

Stretch marks

Stroke

Stroke, mini

Stye

Subarachnoid haemorrhage

Subcutaneous sarcoidosis

Subdural haematoma

Suicide

Sunburn

Superficial thrombophlebitis

Supraventricular tachycardia

Surgery planner

Swallowing pills (problems)

Swallowing problems

Sweat rash

Sweating, excessive (hyperhidrosis)

Swelling or lump

Swimmer's ear

Swine flu

Swollen ankles

Swollen glands

Syncope

Syphilis

Syringomyelia

Systemic lupus erythematosus