See Conditions by First Letter (S)
- Sacrococcygeal Teratoma
- Sacroiliitis
- Salivary Gland Diseases
- Salivary Gland Neoplasms
- Salmonella Infections
- Salpingitis
- Sandhoff Disease
- SAPHO Syndrome
- Sarcoglycanopathies
- Sarcoidosis
- Sarcoidosis, Pulmonary
- Sarcoma
- Sarcoma, Alveolar Soft Part
- Sarcoma, Clear Cell
- Sarcoma, Endometrial Stromal
- Sarcoma, Ewing's
- Sarcoma, Kaposi
- Sarcoma, Synovial
- Sarcopenia
- Scabies
- Scheuermann Disease
- Schistosomiasis
- Schistosomiasis haematobia
- Schistosomiasis mansoni
- Schizophrenia
- Schizophrenia and Disorders with Psychotic Features
- Schizophrenia, Catatonic
- Schizophrenia, Childhood
- Schizophrenia, Disorganized
- Schizophrenia, Paranoid
- Schizotypal Personality Disorder
- Schnitzler Syndrome
- Schwannoma
- Sciatic Neuropathy
- Sciatica
- Scimitar Syndrome
- Scleritis
- Scleroatonic Muscular Dystrophy
- Scleroderma, Diffuse
- Scleroderma, Limited
- Scleroderma, Localized
- Scleroderma, Systemic
- Sclerosis
- Scoliosis
- Scotoma
- Scott Syndrome
- Scrub Typhus
- Scurvy
- Seasonal Affective Disorder
- Sebaceous Gland Diseases
- Seizures
- Seizures, Febrile
- Selective IgA Deficiency
- Self Mutilation
- Self-Injurious Behavior
- Semantic Dementia
- Seminoma
- Senior Loken Syndrome
- Sensation Disorders
- Sensory Neuropathy Type 1
- Sepsis
- Septo-Optic Dysplasia
- Seroma
- Serotonin Syndrome
- Serpiginous Choroiditis
- Sertoli-Leydig Cell Tumor
- Severe Acute Respiratory Syndrome
- Severe Combined Immunodeficiency
- Sex Chromosome Aberrations
- Sex Chromosome Disorders of Sex Development
- Sex Cord-Gonadal Stromal Tumors
- Sexual Dysfunction, Physiological
- Sexual Dysfunctions, Psychological
- Sexually Transmitted Diseases
- Sexually Transmitted Diseases, Viral
- Sezary Syndrome
- Shaken Baby Syndrome
- Shared Paranoid Disorder
- Sharp Syndrome
- Shigellosis
- Shock
- Shock, Cardiogenic
- Shock, Hemorrhagic
- Shock, Septic
- Shock, Surgical
- Shock, Traumatic
- Short Bowel Syndrome
- Shoulder Dislocation
- Shoulder Fractures
- Shoulder Impingement Syndrome
- Shoulder Pain
- Shprintzen-Goldberg Craniosynostosis Syndrome
- Shwachman-Diamond Syndrome
- Shy-Drager Syndrome
- Sialadenitis
- Sialorrhea
- Sick Sinus Syndrome
- Sickle Cell Anemia
- Sickle Cell Trait
- Sideroblastic Anemia Pyridoxine-refractory Autosomal Recessive
- Siderosis
- Sigmoid Neoplasms
- Signs and Symptoms, Digestive
- Signs and Symptoms, Respiratory
- Silicosis
- Silver-Russell Syndrome
- Single Ventricular Heart
- Sinonasal Undifferentiated Carcinoma
- Sinus Thrombosis, Intracranial
- Sinusitis
- Sitosterolemia
- Situs Inversus
- Sjogren's Syndrome
- Skin Abnormalities
- Skin Diseases
- Skin Diseases, Bacterial
- Skin Diseases, Eczematous
- Skin Diseases, Genetic
- Skin Diseases, Infectious
- Skin Diseases, Papulosquamous
- Skin Diseases, Parasitic
- Skin Diseases, Vascular
- Skin Diseases, Vesiculobullous
- Skin Manifestations
- Skin Neoplasms
- Skin Ulcer
- Skull Base Neoplasms
- Skull Fractures
- Sleep Apnea Syndromes
- Sleep Apnea, Central
- Sleep Apnea, Obstructive
- Sleep Bruxism
- Sleep Deprivation
- Sleep Disorders
- Sleep Disorders, Circadian Rhythm
- Sleep Disorders, Intrinsic
- Sleep Initiation and Maintenance Disorders
- Sleep-Wake Transition Disorders
- Small Cell Lung Carcinoma
- Small Intestine Cancer
- Small Non-cleaved Cell Lymphoma
- Smallpox
- Smith-Lemli-Opitz Syndrome
- Smith-Magenis Syndrome
- Smoke Inhalation Injury
- Smoking
- Snake Bites
- Sneezing
- Snoring
- Soft Tissue Infections
- Soft Tissue Injuries
- Soft Tissue Neoplasms
- Soft Tissue Sarcoma
- Solitary Fibrous Tumor, Pleural
- Solitary Fibrous Tumors
- Solitary Pulmonary Nodule
- Somatoform Disorders
- Somatosensory Disorders
- Somatostatinoma
- Spasm
- Spasmodic Dysphonia
- Spasms, Infantile
- Spastic Paraparesis
- Spastic Paraplegia Epilepsy Mental Retardation
- Spastic Paraplegia, Hereditary
- Speech Disorders
- Spermatic Cord Torsion
- Spherocytosis, Hereditary
- Spheroid Body Myopathy
- Sphincter of Oddi Dysfunction
- Sphingolipidoses
- Spielmeyer-Vogt Disease
- Spina Bifida
- Spina Bifida Cystica
- Spinal Cord Compression
- Spinal Cord Diseases
- Spinal Cord Injuries
- Spinal Cord Neoplasms
- Spinal Curvatures
- Spinal Diseases
- Spinal Dysraphism
- Spinal Fractures
- Spinal Injuries
- Spinal Muscular Atrophies of Childhood
- Spinal Muscular Atrophy
- Spinal Muscular Atrophy 1
- Spinal Muscular Atrophy Type 2
- Spinal Neoplasms
- Spinal Osteochondrosis
- Spinal Osteophytosis
- Spinal Shock
- Spinal Stenosis
- Spinocerebellar Ataxia 1
- Spinocerebellar Ataxia 10
- Spinocerebellar Ataxia 2
- Spinocerebellar Ataxia 3
- Spinocerebellar Ataxia Type 6
- Spinocerebellar Ataxias
- Spinocerebellar Degenerations
- Splenic Rupture
- Splenomegaly
- Spondylarthritis
- Spondylarthropathies
- Spondylitis
- Spondylitis, Ankylosing
- Spondylolisthesis
- Spondylolysis
- Spondylosis
- Spontaneous Coronary Artery Dissection
- Sporotrichosis
- Sprains and Strains
- Sprue, Tropical
- Squamous Cell Carcinoma of the Head and Neck
- Staphylococcal Infections
- Staphylococcal Scalded Skin Syndrome
- Staphylococcal Skin Infections
- Stargardt Disease
- Starvation
- Status Asthmaticus
- Status Epilepticus
- Steatorrhea
- Stereotypic Movement Disorder
- Stevens-Johnson Syndrome
- Stickler Syndrome
- Stiff-Person Syndrome
- Still's Disease Adult Onset
- Still's Disease, Adult-Onset
- Stomach Carcinoma
- Stomach Diseases
- Stomach Neoplasms
- Stomach Ulcer
- Stomatitis
- Stomatitis, Aphthous
- Stomatitis, Denture
- Stomatitis, Herpetic
- Stomatognathic Diseases
- Strabismus
- Streptococcal Group A Invasive Disease
- Streptococcal Infections
- Stress Cardiomyopathy
- Stress Disorders, Post-Traumatic
- Stress Disorders, Traumatic
- Stress Disorders, Traumatic, Acute
- Stress, Psychological
- Striae Distensae
- Stroke
- Strongyloidiasis
- Struma Ovarii
- Stupor
- Sturge-Weber Syndrome
- Stuttering
- Subarachnoid Hemorrhage
- Subclavian Steal Syndrome
- Subcutaneous Emphysema
- Subcutaneous Panniculitis-like T-cell Lymphoma
- Subdural Effusion
- Subependymal Giant Cell Astrocytoma
- Subependymoma
- Substance Abuse, Intravenous
- Substance Withdrawal Syndrome
- Substance-Related Disorders
- Succinic Semialdehyde Dehydrogenase Deficiency
- Sudden Infant Death
- Sudden Infant Death Syndrome
- Suicidal Ideation
- Suicide
- Suicide, Assisted
- Suicide, Attempted
- Sulfite Oxidase Deficiency
- Sunburn
- Superficial Spreading Melanoma
- Superior Limbic Keratoconjunctivitis
- Superior Vena Cava Syndrome
- Suppuration
- Supraglottic Laryngeal Cancer
- Supranuclear Palsy, Progressive
- Supratentorial Neoplasms
- Supratentorial Primitive Neuroectodermal Tumor
- Supratentorial Primitive Neuroectodermal Tumors, Childhood
- Supravalvular Aortic Stenosis
- Surgical Wound Dehiscence
- Surgical Wound Infection
- Susac Syndrome
- Swayback
- Sweat Gland Diseases
- Sweating, Gustatory
- Sweet Syndrome
- Sydenham's Chorea
- Syncope
- Syncope, Vasovagal
- Syndactyly
- Syndrome
- Synovial Cyst
- Synovial Sarcoma
- Synovitis
- Synovitis, Pigmented Villonodular
- Syphilis
- Syphilis, Latent
- Syringoma
- Syringomyelia
- Systemic Candidiasis
- Systemic Capillary Leak Syndrome
- Systemic Inflammatory Response Syndrome
- Systemic Mastocytosis
- Systemic Onset Juvenile Idiopathic Arthritis
- Systemic Vasculitis