Main Campus: Chesterfield, MO 63017 | 
Diseases & Conditions
- SAD
- SAD - social anxiety disorder
- Salivary duct stones
- Salivary gland infections
- Salivary gland tumors
- Salmon patch
- Salmonella enterocolitis
- Salmonellosis
- Salt-wasting nephropathy
- San Joaquin Valley fever
- Sanfilippo syndrome
- Sarcoidosis
- Sarcoidosis - nervous system
- Sarcoma botryoides
- Sarcoptes scabiei
- SARS
- SBP
- Scabies
- Scalded skin syndrome
- Scaphocephaly
- Scar - hypertrophic
- Scar - keloid
- Scarlatina
- Scarlet fever
- SCD
- Schatzki's ring
- Scheie syndrome
- Scheuermann disease
- Scheuermann's disease
- Schilder-Addison Complex
- Schistosomiasis
- Schizoaffective disorder
- Schizoid personality disorder
- Schizophrenia
- Schizophrenia - tardive dyskinesia
- Schizotypal personality disorder
- SCI
- SCI - autonomic dysreflexia
- Sciatic nerve dysfunction
- Sciatica
- Sciatica - herniated disk
- SCLC
- Scleritis
- Scleroderma
- Scleroma
- Sclerosing cholangitis
- Scoliosis
- Scoliosis - Rett syndrome
- Scorbutus
- Scratch - corneal
- Screening - asymptomatic bacteria
- Scrofula
- Scrotal growth
- Scrotal masses
- Scrotum - empty (anorchia)
- Scrotum - empty (undescended testes)
- Scurvy
- SDAT
- Seasonal affective disorder
- Seasonal allergic rhinitis
- Seasonal allergy
- Seasonal depression
- Seatworm
- Sebaceous cyst
- Seborrheic dermatitis
- Seborrheic dermatitis - infant
- Seborrheic dermatitis – infant
- Seborrheic eczema
- Seborrheic keratosis
- Second-degree heart block
- Secondard bone tumor
- Secondary bone tumor
- Secondary cardiac amyloidosis - AA type
- Secondary fibrinolysis
- Secondary glaucoma
- Secondary hypogonadism
- Secondary myelofibrosis
- Secondary parkinsonism
- Secondary peritonitis
- Secondary pulmonary hypertension
- Secondary syphilis
- Secondary systemic amyloidosis
- Secondary tracheomalacia
- Secretory otitis media
- Secundum ASD
- Segmental glomerulosclerosis
- Seizure - absence
- Seizure - eclampsia
- Seizure - fever induced
- Seizure - generalized
- Seizure - grand mal
- Seizure - partial (focal)
- Seizure - petit mal
- Seizure - tonic-clonic
- Seizure disorder
- Seizure disorder - children
- Selective deficiency of IgA
- Selective mutism
- Semantic dementia
- Seminoma testicular cancer
- Senile amyloidosis
- Senile angioma
- Senile dementia - Alzheimer type (SDAT)
- Senile dementia - Alzheimer's type (SDAT)
- Senile keratosis
- Senile or solar lentigines
- Senior-Loken syndrome
- Sensorimotor polyneuropathy
- Sensorineural hearing loss - infants
- Separation anxiety in children
- Sepsis
- Sepsis - infant
- Sepsis neonatorum
- Sepsis syndrome
- Septic arthritis
- Septic shock
- Septic shock
- Septicemia
- Septicemia
- Septicemic plague
- Septicemic shock
- Seropositive rheumatoid arthritis (RA)
- Serotonergic syndrome
- Serotonin syndrome
- Serotonin toxicity
- Serous labyrinthitis
- Serous otitis media
- Serrated adenoma
- Serrated polyp
- Sertoli-Leydig cell tumor
- Sertoli-stromal cell tumor
- Serum prothrombin conversion accelerator deficiency
- Serum sickness
- Seventh cranial nerve palsy due to birth trauma
- Severe acute respiratory syndrome (SARS)
- Severe PMS
- Sex - delayed ejaculation
- Sex cord tumor
- Sexual dysfunction - male
- Sexual dysfunction - vaginismus
- Sexually transmitted - chlamydia
- Sexually transmitted disease (STD) - warts
- Sexually transmitted disease - chlamydia male
- Sexually transmitted disease - syphilis
- Sexually transmitted disease – chancroid
- Sexually transmitted disease – donovanosis
- Sexually transmitted infection (STI) - warts
- Sexually transmitted infection - syphilis
- Sexually transmitted infection - trichomonas vaginitis
- Sexually transmitted infection – chancroid
- Sexually transmitted infection – donovanosis
- Shaking - drug tremor
- Shaking - essential tremor
- Shaking palsy
- Sheehan syndrome
- Shigella enteritis
- Shigella gastroenteritis
- Shigellosis
- Shingles
- Shock - anaphylactic
- Shock - cardiogenic
- Shock - hypovolemic
- Shock liver
- Shock lung
- Short bowel syndrome
- Short gut syndrome
- Short stature - growth hormone deficiency
- Shortsightedness
- Shoulder impingement syndrome
- Shoulder overuse syndrome
- Shoulder pain - frozen
- Shoulder-hand syndrome
- Shy-Drager syndrome
- Shy-McGee-Drager syndrome
- SIADH
- Sialadenitis
- Sialolithiasis
- SIBO
- Sicca syndrome
- Sick sinus syndrome
- Sickle cell anemia
- Sickle cell disease
- Sideropenic dysphagia
- SIDS
- Silent ear infection
- Silent infection - HBV children
- Silent infection - HCV children
- Silent otitis media
- Silent thyroiditis
- Silicoproteinosis
- Silicosis
- Silver syndrome
- Silver-Russell syndrome
- Simple goiter
- Simple pulmonary eosinophilia
- Singapore hemorrhagic fever
- Single ventricle
- Sinus arrest - sick sinus
- Sinus infection
- Sinus node dysfunction
- Sinus pause - sick sinus
- Sinusitis
- Sinusitis - acute
- Sinusitis - chronic
- Siphonaptera
- Sipple syndrome
- SIRS
- Sixth disease
- Sixth nerve palsy
- Sjögren syndrome
- Skin - yellow
- Skin abscess
- Skin cancer - basal cell
- Skin cancer - melanoma
- Skin cancer - squamous cell
- Skin growths - fatty
- Skin infection - bacterial
- Skin infection - erysipeloid
- Skin infection - fungal
- Skin infection - staphylococcal
- Skin infection - yeast
- Skin lesion - actinic keratosis
- Skin lesion of blastomycosis
- Skin pigment disorder - acanthosis nigricans
- Skin rash - contact dermatitis
- Skin spots - aging
- Skin tag
- Slapped cheek
- Slapped cheek rash
- SLE
- Sleep - natural short sleeper
- Sleep apnea - central
- Sleep apnea - obstructive
- Sleep apnea - obstructive - adults
- Sleep apnea - pediatric
- Sleep disorder - insomnia
- Sleep disorders - overview
- Sleep disorders in older adults
- Sleep disruptive behaviors
- Sleep hygiene - insomnia
- Sleep issues
- Sleep paralysis - isolated
- Sleep rhythm
- Sleep terror disorder
- Sleep-disordered breathing
- Sleep-disordered breathing - adults
- Sleep-disordered breathing - pediatric
- Sleep-wake syndrome - irregular
- Sleeping sickness
- Sleepwalking
- SLI
- Slipped capital femoral epiphysis
- Slipped disk
- Slow heart rate - sick sinus
- Slurred speech
- Small bowel bacterial overgrowth
- Small cell lung cancer
- Small intestinal bacterial overgrowth
- Small intestinal ischemia and infarction
- Small intestine insufficiency
- Small noncleaved cell lymphoma
- Smallpox
- Smokeless snuff
- Smokeless tobacco - nicotine addiction
- Smoker's keratosis
- Smoking - nicotine addiction and withdrawal
- Smooth tongue
- Snail fever
- Social anxiety disorder
- Social phobia
- Sociopathic personality
- Sociopathy
- Sodoku
- Soft chancre
- Soft spot - craniosynostosis
- Soft tissue cancer - rhabdomyosarcoma
- Soft tissue gangrene
- Soft tissue sarcoma
- Soiling
- Solar keratosis
- Solitary fibrous tumor
- Solitary fibrous tumor of the pleura
- Solitary pulmonary nodule
- Somatic symptom and related disorders
- Somatic symptom and related disorders
- Somatic symptom disorder
- Somatic symptom disorder
- Somatiform disorders
- Somatization disorder
- Somatotroph adenoma
- Somnambulism
- Somnolence - idiopathic
- Sore throat
- Sore throat - tonsillitis
- Sore throat strep
- Sound distortion
- Spasm of the esophagus
- Spasmodic bladder
- Spasmodic croup
- Spasmodic dysphonia
- Spasmodic torticollis
- Spasmus nutans
- Spastic colitis
- Spastic colon
- Spastic diplegia
- Spastic hemiplegia
- Spastic paralysis
- Spastic quadriplegia
- Specific developmental language disorder
- Specific language impairment
- Specific learning disorder with impairment in written expression
- Speech disfluency
- Speech disorder - apraxia
- Speech disorder - phonological
- Speech disorder - spasmodic dysphonia
- Speech disorder - stuttering
- Speech disorders - children
- Speech disorders - dysarthria
- Speech distortion
- Spell - newborns
- Spherocytosis
- Sphingomyelinase deficiency
- Spider angioma
- Spider nevus
- Spider telangiectasia
- Spider veins
- Spielmeyer-Vogt
- Spinal abscess
- Spinal cord abscess
- Spinal cord injury
- Spinal cord injury - autonomic dysreflexia
- Spinal cord trauma
- Spinal curvature
- Spinal muscular atrophy
- Spinal stenosis
- Spinal tumor
- Spinocerebellar degeneration
- Spirillary fever
- Splenectomy - post-surgery syndrome
- Splenic infarction
- Splenomegalic polycythemia
- Spondylitis
- Spondylitis - psoriatic arthritis
- Spondyloarthritis
- Spondyloarthropathy
- Spondylolisthesis
- Spongy degeneration of the brain
- Spontaneous bacterial peritonitis
- Spontaneous bacterial peritonitis (SBP)
- Spontaneous pneumothorax
- Sporadic primary pulmonary hypertension
- Sporotrichosis
- Spotted fever
- Sprue
- Squamous cell cancer - mouth
- Squamous cell cancer - penis
- Squamous cell carcinoma - anal
- Squamous cell carcinoma - lung
- Squamous cell carcinoma of the skin
- Squamous cell skin cancer
- Squamous intraepithelial lesion - dysplasia
- Squint
- SSPE
- SSRI - serotonin syndrome
- ST - elevation myocardial infarction
- ST elevation myocardial infarction - ACS
- ST-elevation myocardial infarction
- ST-elevation myocardial infarction-ACS
- St. Vitus dance
- Stable angina
- Stagnant loop syndrome
- Stammering
- Stapedectomy
- Staph - impetigo
- Staph - MRSA
- Staph infection - abscess
- Staph skin infection
- Staphylococcal - MRSA
- Staphylococcal meningitis
- Staphylococcal scalded skin syndrome (SSS)
- Staphylococcal toxic shock syndrome
- Staphylococcus - impetigo
- Staphylococcus aureus - endocarditis
- Staphylococcus aureus - endocarditis - children
- Stasis dermatitis and ulcers
- Stasis syndrome
- STD - chancroid
- STD - chlamydia
- STD - chlamydia male
- STD - donovanosis
- STD - syphilis
- STD - trichomonas vaginitis
- Steatosis
- STEC-HUS
- Steely hair disease
- Stein-Leventhal syndrome
- Stem cell transplant - graft-versus-host disease
- Stenosis - carotid
- Stenosis - pulmonary valve
- Stenosis - renal artery
- Stereotypic movement disorder
- Stevens-Johnson syndrome
- STI - chancroid
- STI - chlamydia
- STI - donovanosis
- STI - syphilis
- STI - trichomonas vaginitis
- Stiff heart syndrome
- Stiff lung
- Still disease
- Still's disease
- Still's disease - adult
- Stomach cancer
- Stomach flu
- Stomatitis - herpetic
- Stomatitis - ulcerative
- Stomatitis – herpetic
- Stones - bladder
- Stones - cystine
- Stones - kidney
- Stork bite
- Strabismus
- Strangulation
- Strawberry mark
- Strawberry nevus
- Streeter dysplasia
- Streeter's dysplasia
- Strep - impetigo
- Strep infection - erysipelas
- Strep throat
- Strep throat - rheumatic fever
- Strep throat - Sydenham chorea
- Streptobacillary fever
- Streptobacillosis
- Streptococcal - Sydenham chorea
- Streptococcal infection - erysipelas
- Streptococcal pharyngitis
- Streptococcal proctitis
- Streptococcus - impetigo
- Streptococcus - rheumatic fever
- Streptococcus - Sydenham chorea
- Streptococcus pyogenes - rheumatic fever
- Streptococcus viridans - endocarditis
- Streptococcus viridians - endocarditis - children
- Stress incontinence
- Stress urinary incontinence
- Stroke
- Stroke - AVM
- Stroke - carotid artery
- Stroke - hemorrhagic
- Stroke - ischemic
- Stromal tumor
- Strongyloidiasis
- Struvite - stones
- STS
- Stuart-Prower deficiency
- Student's elbow
- Sturge-Weber syndrome
- Stuttering
- Stuttgart disease
- Stye
- Subacute combined degeneration
- Subacute combined degeneration of the spinal cord
- Subacute granulomatous thyroiditis
- Subacute lymphocytic thyroiditis
- Subacute nonsuppurative thyroiditis
- Subacute sclerosing leukoencephalitis
- Subacute sclerosing panencephalitis
- Subacute thyroiditis
- Subarachnoid hemorrhage
- Subareolar abscess
- Subclavian artery occlusive syndrome
- Subclavian steal syndrome
- Subconjunctival hemorrhage
- Subcutaneous abscess
- Subdural effusion
- Subdural hematoma
- Subdural hematoma - chronic
- Subdural hemorrhage
- Subdural hemorrhage - chronic
- Subdural hygroma
- Subfalcine herniation
- Sublingual space infection
- Submandibular space infection
- Substance abuse
- Substance abuse - opiate withdrawal
- Substance use - alcohol
- Substance use - opiate withdrawal
- Substance use disorder
- Subungual warts
- Sudden cardiac arrest, SCA
- Sudden increased intracranial pressure
- Sudden infant death syndrome
- Sudeck atrophy
- Sudeck's atrophy
- Suicide and suicidal behavior
- Suitcase elbow
- Sun-induced skin changes - keratosis
- Sun-induced skin changes - liver spots
- Superficial spreading melanoma
- Superficial thrombophlebitis
- Superior vena cava obstruction
- Superior vena cava syndrome
- Supraglottitis
- Supranuclear ophthalmoplegia
- Supraventricular tachycardia
- Surgery - ankle - arthroscopic
- Surgery - ankle - arthroscopy
- Surgery - compartment syndrome
- Surgery - wrist - arthroscopic
- Surgery - wrist - arthroscopy
- Surgical nail avlusion
- Sustained virologic response - hepatitis C
- SVC obstruction
- SVR - hepatitis C
- Swallowing difficulty
- Swallowing problems - achalasia
- Swallowing problems - esophageal ring
- Swamp fever
- Sweating - excessive
- Swimmer's ear
- Swimmer's itch
- Swimmer's shoulder
- Swimming pool granuloma
- Swine flu
- Swineherd's disease
- Sydenham chorea
- Syndrome of inappropriate ADH release
- Syndrome of inappropriate antidiuresis
- Syndrome of inappropriate antidiuretic hormone secretion
- Syndrome X
- Synostosis
- Synovial sarcoma
- Synovitis - toxic
- Syphilis
- Syphilis - neurosyphilis
- Syphilitic aneurysm
- Syphilitic aseptic meningitis
- Syphilitic myeloneuropathy
- Syphilitic myelopathy
- Syringomyelia
- Syrinx
- Systemic exertion intolerance disease (SEID)
- Systemic inflammatory response syndrome
- Systemic lupus erythematosus
- Systemic necrotizing vasculitis
- Systemic sclerosis
- Systolic click-murmur syndrome
