• Squamous cell cancer
• Squamous cell cancer - mouth see Oral cancer
• Squamous cell cancer - penis see Cancer - penis
• Squamous cell hyperplasia see Hyperplastic dystrophy
• Squint see Strabismus
• SSPE see Subacute sclerosing panencephalitis
• St. Vitus dance see Sydenham chorea
• Stage 1 Lyme disease see Lyme disease - primary
• Stage 3 Lyme disease see Lyme disease - chronic persistent
• Stagnant loop syndrome see Blind loop syndrome
• Standard ophthalmic exam
• Staph aureus food poisoning
• Staph skin infection see Carbunculosis
• Staphylococcal meningitis see Meningitis - staphylococcal
• Staphylococcal scalded skin syndrome (SSS) see Scalded skin syndrome
• Staphylococcal toxic shock syndrome see Toxic shock syndrome
• Starch ingestion
• Starches see Carbohydrates
• Startle reflex see Moro reflex
• Startle response see Moro reflex
• Stasis dermatitis and ulcers
• Stasis syndrome see Blind loop syndrome
• STD and ecological niches
• Steam iron cleaner
• Steely hair disease see Menkes syndrome
• Stein-Leventhal syndrome see Polycystic ovary disease
• Stellachrome see Merbromin overdose
• Stem cell research
• Stenosis - renal artery see Renal artery stenosis
• Stent
• Stereotypic movement disorder
• Sterile meningitis see Aseptic meningitis
• Sterilization surgery - female see Tubal ligation
• Sterilization surgery -- making a decision
• Sterilization surgery - male see Vasectomy
• Sternal tap see Bone marrow aspiration
• Sternutation see Sneezing
• Stevens-Johnson syndrome see Erythema multiforme
• Stiff heart syndrome see Cardiac amyloidosis
• Stiff lung see ARDS (acute respiratory distress syndrome)
• Stiffness in a joint see Joint pain
• Still's disease see Juvenile rheumatoid arthritis
• Stillbirth
• Stimulants
• Stimulus
• Stingray
• Stings - marine animals see Marine animal stings or bites
• Stoddard solvent
• Stomach acid test
• Stomach cancer see Gastric cancer
• Stomach pain see Abdominal pain
• Stomach pumping see Gastric suction
• Stomach tube insertion see Feeding tube insertion - gastrostomy
• Stomach ulcer see Gastric ulcer
• Stomach upset see Nausea and vomiting
• Stomachache see Abdominal pain diagnosis
• Stomatitis - herpetic see Herpetic stomatitis
• Stomatitis - ulcerative see Mouth ulcers
• Stonefish
• Stones - bladder see Bladder stones
• Stones - cystine see Cystinuria
• Stones - kidney see Nephrolithiasis
• Stool - trypsin and chymotrypsin see Trypsin and chymotrypsin in stool
• Stool C. difficile toxin
• Stool culture see Fecal culture
• Stool Gram stain
• Stool guaiac test
• Stool occult blood test see Fecal occult blood test (FOBT)
• Stool occult blood test - flushable home test see Flushable reagent stool blood test
• Stool occult blood test - guaiac smear see Stool guaiac test
• Stool ova and parasites exam
• Stool smear see Fecal smear
• Stools - black or tarry see Bloody or tarry stools
• Stools - bloody see Bloody or tarry stools
• Stools - floating
• Stools - foul smelling
• Stools - pale or clay colored
• Stools - watery see Diarrhea
• Storage pool disease see Congenital platelet function defects
• Storing medicine safely
• Stork bite
• Strabismus
• Strabismus repair see Eye muscle repair
• Straddle injury see Genital injury
• Straddle injury see Traumatic injury of the bladder and urethra
• Strains
• Stratigraphy see Chest tomogram
• Strawberry mark see Birthmarks - red
• Strawberry nevus see Hemangioma
• Streeter's dysplasia see Amniotic constriction bands
• Strep throat
• Streptobacillary fever see Rat-bite fever
• Streptobacillosis see Rat-bite fever
• Streptococcal pharyngitis see Strep throat
• Streptococcal proctitis see Proctitis - streptococcal
• Streptococcal screen
• Streptococcus agalactiae see Group B streptococcal septicemia of the newborn
• Stress see Stress and anxiety
• Stress and anxiety
• Stress and backaches see Backaches and stress
• Stress ECG see Exercise stress test
• Stress Echocardiography
• Stress fracture see Broken bone
• Stress gastritis
• Stress in childhood
• Stress incontinence
• Stress management
• Stress reduction and exercise see Exercise and stress reduction
• Stress test - echocardiography see Stress Echocardiography
• Stress test - exercise treadmill see Exercise stress test
• Stress ulcer see Stress gastritis
• Stress vs. anxiety
• Stretch marks see Striae
• Striae
• Striae atrophica see Striae
• Striae distensae see Striae
• Stridor see Breathing sounds - abnormal (stridor)
• String test
• Stroke
• Stroke - hemorrhagic see Hemorrhagic stroke
• Stroke secondary to atherosclerosis
• Stroke secondary to atrial fibrillation see Stroke secondary to cardiogenic embolism
• Stroke secondary to cardiogenic embolism
• Stroke secondary to carotid dissection
• Stroke secondary to carotid stenosis
• Stroke secondary to cocaine
• Stroke secondary to FMD
• Stroke secondary to syphilis
• Stromal tumor see Arrhenoblastoma of ovary
• Strongyloidiasis
• Struma lymphomatosa see Chronic thyroiditis (Hashimoto's disease)
• Stuart-Prower deficiency see Factor X deficiency
• Stuffy nose see Nasal congestion
• Stuporous see Consciousness - decreased
• Sturge-Weber syndrome
• Stuttering
• Stuttering and children
• Stuttgart disease see Leptospirosis
• Stye see Eyelid bump
• Subacute combined degeneration
• Subacute combined degeneration of the spinal cord see Subacute combined degeneration
• Subacute lymphocytic thyroiditis see Painless (silent) thyroiditis
• Subacute sclerosing leukoencephalitis see Subacute sclerosing panencephalitis
• Subacute sclerosing panencephalitis
• Subacute thyroiditis
• Subarachnoid hemorrhage
• Subareolar abscess
• Subclavian artery occlusive syndrome see Aortic arch syndrome
• Subclavian steal syndrome see Aortic arch syndrome
• Subconjunctival hemorrhage
• Subcutaneous
• Subcutaneous abscess see Skin abscess
• Subcutaneous air see Subcutaneous emphysema
• Subcutaneous emphysema
• Subdural effusion
• Subdural hematoma
• Subdural hematoma - chronic see Chronic subdural hematoma
• Subdural hemorrhage see Subdural hematoma
• Subdural hemorrhage - chronic see Chronic subdural hematoma
• Subfalcine herniation see Brain herniation
• Sublingual space infection see Ludwig's angina
• Submandibular space infection see Ludwig's angina
• Substance abuse see Drug abuse
• Substance abuse recovery and diet see Diet and substance abuse recovery
• Substernal thyroid see Retrosternal thyroid
• Subungual warts see Warts
• Sucrose hemolysis test see Sugar-water hemolysis test
• Suction curettage see Abortion
• Sudden infant death syndrome
• Sudeck's atrophy see Complex regional pain syndrome
• Sugars see Carbohydrates
• Sugar-water hemolysis test
• Suicide and suicidal behavior
• Sulfhemoglobin see Hemoglobin derivatives
• Sulfites see Photographic fixative
• Sulfuric acid
• Sulindac overdose
• Sunburn
• Sunburn first aid
• Sun-induced skin changes - keratosis see Actinic keratosis
• Sun-induced skin changes - liver spots see Liver spots
• Sunken fontanelles see Fontanelles - sunken
• Sunless tanners see Tanning agents
• Sunscreen ingestion
• Super Glue see Cyanoacrylates
• Superficial thrombophlebitis
• Superior vena cava obstruction see SVC obstruction
• Superior vena cava syndrome see SVC obstruction
• Supernumerary digits see Polydactyly
• Supernumerary nipples
• Support groups - by disease and condition see Resources
• Supraglottitis see Epiglottitis
• Supranuclear ophthalmoplegia
• Suprapubic catheters see Urinary catheters
• Suprapubic prostatectomy see Prostate removal
• Supraventricular tachycardia see Paroxysmal supraventricular tachycardia (PSVT)
• Surface echo see Echocardiogram
• Surgeon - how to choose a good one see Choosing a qualified surgeon
• Surgeries for female stress incontinence
• Surgery - brain see Brain surgery
• Surgery using laser see Laser surgery
• Surgical abortion see Abortion
• Surgical excision
• Sutures - cranial see Cranial sutures
• Sutures - ridged
• Sutures - separated
• SVC obstruction
• Swab for respiratory viruses see Nasopharyngeal culture
• Swab for Staph carriage see Nasopharyngeal culture
• Swallowing difficulty
• Swallowing or inhaling a foreign object
• Swallowing pain or burning
• Swamp fever see Leptospirosis
• Swan-Ganz - right heart catheterization
• Swayback see Lordosis
• Sweat - cold see Skin - clammy
• Sweat chloride see Sweat electrolytes
• Sweat electrolytes
• Sweat test see Sweat electrolytes
• Sweating - absent
• Sweating - excessive
• Sweeteners
• Swelling
• Swelling - eyes see Angioedema
• Swelling in the abdomen see Abdomen - swollen
• Swelling of a joint see Joint swelling
• Swelling of the ankles - feet - legs see Foot, leg, and ankle swelling
• Swelling of the face see Facial swelling
• Swelling of the scrotum see Scrotal swelling
• Swimmer's ear
• Swimmer's ear - chronic
• Swimmer's itch see Schistosomiasis
• Swimmer's shoulder see Rotator cuff tendinitis
• Swimming pool cleaners
• Swimming pool granuloma
• Swineherd's disease see Leptospirosis
• Swollen belly see Abdomen - swollen
• Swollen eye or conjunctiva see Chemosis
• Swollen glands
• Swollen gums see Gums - swollen
• Swollen lymph nodes see Swollen glands
• Sydenham chorea
• Sympathomimetic intoxication see Amphetamine or sympathomimetic intoxication
• Symptomatic
• Synalgos see Aspirin overdose
• Syncope see Fainting
• Syndactyly see Webbing of the fingers or toes
• Syndactyly repair see Repair of webbed fingers or toes
• Syndrome of inappropriate antidiuretic hormone secretion see Dilutional hyponatremia (SIADH)
• Synovectomy see Knee arthroscopy
• Synovial biopsy
• Synovial fluid analysis
• Synovitis - toxic see Toxic synovitis
• Syphilis
• Syphilis - primary
• Syphilis - secondary
• Syphilis - tertiary
• Syphilitic aneurysm see Thoracic aortic aneurysm
• Syphilitic aseptic meningitis
• Syphilitic myelopathy
• Syphilitic stroke see Stroke secondary to syphilis
• Syringomyelia
• Syrinx see Syringomyelia
• Systemic
• Systemic coccidioidomycosis see Coccidioidomycosis - disseminated
• Systemic histoplasmosis see Histoplasmosis - disseminated
• Systemic inflammatory response syndrome (SIRS) see Sepsis
• Systemic lupus erythematosus
• Systemic sclerosis (scleroderma)
• Systolic blood pressure see Blood pressure
• Systolic click-murmur syndrome see Mitral valve prolapse

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