SA
- Sacral dimple
- Sacroiliitis
- Salivary gland tumors
- Salmonella infection
- Sarcoidosis
- Sarcoma
- Sarcoma; Cancer, bone (See: Bone Cancer)
SC
- Scabies
- Scarlatina (see: Scarlet fever)
- Scarlet Fever
- Schwannoma
- Sciatica
- Scleroderma
- Scoliosis
- Scrotal masses
SE
- Sebaceous carcinoma
- Seborrheic dermatitis
- Seborrheic keratosis
- Secondary brain cancer (See: Brain metastases)
- Seizure disorder (See: Epilepsy)
- Seizure, absence (See: Absence seizure)
- Seizures
- Selective IgA deficiency
- Sepsis
- Septal defect, atrial (See: Atrial Septal Defect)
- Septic arthritis
- Serotonin syndrome
- Severe Acute Respiratory Syndrome (SARS)
- Sex headaches
- Sexually transmitted diseases (STDs) (see: Sexually transmitted infections (STIs))
- Sexually transmitted infections (STIs)
SH
SI
- Sick sinus syndrome
- Sickle cell anemia
- Sinus headaches
- Sinus node dysfunction (See: Sick sinus syndrome)
- Sixth disease (See: Roseola)
SK
SL
- Sleep apnea
- Sleep apnea, obstructive (See: Obstructive sleep apnea)
- Slipped disk, Disc Herniation (See: Herniated disk)
SM
SN
SO
- Soft palate cancer
- Soft tissue sarcoma
- Soft tissue, cancer (See: Soft tissue sarcoma)
- Solar keratosis (See: Actinic keratosis)
- Solar lentigines (See: Age spots)
- Solitary fibrous tumor
- Solitary rectal ulcer syndrome
- Sore throat (see: Pharyngitis)
SP
- Spermatocele
- Spina bifida
- Spinal arteriovenous malformation
- Spinal cord injury
- Spinal cord tumor
- Spinal headaches
- Spinal stenosis
- Splenomegaly (See: Enlarged spleen)
- Spontaneous Coronary Artery Dissection (SCAD)
- Sports-induced asthma (See: Exercise-induced asthma)
- Sprain
- Sprained Ankle
ST
- Stammering (See: Stuttering)
- Staph infection (See: Staphylococcus infection)
- Staphylococcus infection
- Steele-Richardson-Olszewski syndrome (See: Progressive supranuclear palsy (PSP))
- Stenosing tenosynovitis (See: Trigger finger)
- Stenosis, pyloric (See: Pyloric stenosis)
- Steven-Johnson syndrome
- Stomach cancer
- Stomach flu (See:Viral gastroenteritis)
- Stomach polyps
- Strep throat
- Stress cardiomyopathy (See: Broken heart syndrome)
- Stress fractures
- Stress Incontinence
- Stroke
- Stuttering
SU
- Subarachnoid hemorrhage
- Subconjunctival hemorrhage (broken blood vessel in eye)
- Sudden cardiac arrest
- Sudden infant death syndrome (SIDS)
- Sun allergy (See: Polymorphous light eruption (PMLE))
- Sun poisoning (See: Polymorphous light eruption (PMLE))
- Sunstroke (see: Heatstroke)
- Supranuclear palsy, progressive supranuclear palsy
- Supraventricular tachycardia
- Suspicious breast lumps
SW
