S
- Salmonella infection
- Scabies
- Scarlet fever
- Schizophrenia
- Sciatica
- Seasonal affective disorder(SAD)
- Seborrheic dermatitis
- Self-injury/cutting
- Semen allergy
- Separation anxiety
- Sexually transmitted diseases
- Shaken baby syndrome
- Shellfish allergy
- Shingles
- Sickle cell anaemia
- Sinus headache
- Sjogren's Syndrome
- Skin cancer
- Sleep apnea
- Sleepwalking
- Smallpox
- Snoring
- Social anxiety disorder
- Sore throat
- Soy allergy
- Spina bifida
- Spinal cord injury
- Sprains and strains
- Staph infections
- Stomach cancer
- Strep throat
- Stress
- Stretch marks
- Stroke
- Sty
- Sudden cardiac arrest
- Sudden infant death syndrome
- Suicide
- Sunburn
- Sweating and body odour
- Swollen lymph nodes
- Syphilis