Harrison's Manual of Medicine
- saccular (intracranial) aneurysm
- safinamide, for Parkinson's disease
- saline infusion test
- salmeterol, for asthma
- salmonellosis
- salpingitis
- salpingo-oophorectomy
- salvia
- samarium-153 therapy
- Sarcoptes scabiei infestation: see scabies
- SARS-CoV (SARS-associated coronavirus)
- sausage digits
- saxagliptin, for diabetes mellitus
- Sb (sodium stibogluconate), for leishmaniasis
- scabies
- scale (skin lesion)
- scar
- scar carcinoma
- scarlet fever
- scedosporiosis
- schistocytes
- schizoid personality disorder
- schizophrenia
- schizotypal personality disorder
- sciatic neuropathy
- SCID (severe combined immunodeficiency)
- sclerodactyly
- scombroid poisoning
- scorpionfish envenomation
- scorpion sting
- screening recommendations
- sea anemone injury
- seal finger
- seborrheic keratosis
- secondary progressive multiple sclerosis (SPMS)
- Segawa syndrome
- selection bias
- selenium sulfide, for seborrheic dermatitis
- semaglutide, for diabetes mellitus
- semen analysis
- senna, for constipation
- sensitization
- sensory examination
- sensory level
- sensory loss
- sentinel node biopsy, in breast cancer
- septal panniculitis
- serotonin/norepinephrine reuptake inhibitors (SNRIs)
- serous otitis media (SOM)
- Serratia infections
- sevelamer, for hyperphosphatemia
- severe combined immunodeficiency (SCID)
- sexual assault
- shoulder, muscles and innervation of
- sick euthyroid syndrome
- sickled cells
- sick sinus syndrome (SSS)
- silent ischemia
- silicosis
- simple phobia
- simvastatin, for dyslipidemia
- Sindbis virus infections
- single photon emission computed tomography (SPECT)
- single pulse transcranial magnetic stimulation, for migraine
- Sin Nombre virus
- sinusoidal obstruction syndrome
- sinus rhythm
- sinus venosus
- siponimod, for multiple sclerosis
- sipuleucel-T, for prostate cancer
- sirolimus, for immunosuppression after renal transplantation
- Sister Mary Joseph's nodule
- sitagliptin, for diabetes mellitus
- sitosterolemia
- Sjögren's syndrome
- skin biopsy
- skin tag
- skull fracture
- slit-lamp examination
- slow low-efficiency dialysis (SLED)
- SLR (straight leg raising) sign
- small-bowel tumors
- smallpox
- smoke inhalation
- snoring
- SNRIs (serotonin/norepinephrine reuptake inhibitors)
- social phobia
- sodium bicarbonate, for metabolic acidosis
- sodium citrate, for metabolic acidosis
- sodium docusate, for constipation
- sodium-glucose cotransporter 2 (SLGT2) inhibitors, for diabetes mellitus
- sodium loading test
- sodium oxybate, for narcolepsy
- sodium phosphate enema, for constipation
- sodium stibogluconate (Sb), for leishmaniasis
- sodium zirconium cyclosilicate (ZS-9), for hyperkalemia
- SOFA score
- sofosbuvir, for hepatitis C
- SOM (serous otitis media)
- somatic pain
- somatic symptom disorder
- somatotropin, for hypopituitarism
- sotalol, for arrhythmias
- South American blastomycosis
- soy-based products
- spasmodic dysphonia
- spastic colon
- SPECT (single photon emission computed tomography)
- spectinomycin, for gonococcal infections
- spermatogenesis
- spherocytes
- spider bite
- spinal cord infarction
- spinal manipulation, for chronic back pain
- spinal stenosis
- spinocerebellar ataxia
- Spirillum minor infections
- spirometry
- splenic abscess
- SPMS (secondary progressive multiple sclerosis)
- spondylitic myelopathy
- spondyloarthritides
- spondylolisthesis
- spontaneous breathing trial
- sporozoite
- spur cell anemia
- SSPE (subacute sclerosing panencephalitis)
- SSS (sick sinus syndrome)
- SSSS (staphylococcal scalded-skin syndrome)
- stabbing headache, primary
- standard precautions
- staphylococcal scalded-skin syndrome (SSSS)
- starvation
- stasis ulcer
- Stauffer's syndrome
- stereognosis
- sterilization
- Stevens-Johnson syndrome
- stiff-person syndrome
- stingray envenomation
- stonefish envenomation
- stool analysis
- straight leg raising (SLR) sign
- strawberry tongue
- Streptobacillus moniliformis infections
- stress testing, in coronary artery disease
- stromal tumor
- strontium-89 therapy
- struvite stones
- stupor
- subacute sclerosing panencephalitis (SSPE)
- subdural hematoma
- sudden death
- sulfadoxine-pyrimethamine, for malaria
- sulfhemoglobinemia
- sulfinpyrazone, for gout
- sulfonamides, antibacterial resistance to
- sulfone syndrome
- sulfonylureas, for diabetes mellitus
- summer grippe
- superior vena cava syndrome
- supraventricular arrhythmia, in STEMI
- suramin, for sleeping sickness
- surgical wound infections
- SVR (systemic vascular resistance)
- swallowing studies
- Sweet's syndrome
- swinging flashlight test
- sympathectomy, digital, for systemic sclerosis
- sympathomimetics, for allergic rhinitis
- synkinesis
- syringomyelia
- systemic vascular resistance (SVR)