“Explore our comprehensive A-Z guide on diseases and conditions. Discover detailed information on definitions, symptoms, causes, and treatments to better understand various health issues.”
- Sacral Dimple
- Sacroiliitis
- Saddle Nose
- Salivary Gland Cancer
- Salivary Stones (Sialolithiasis)
- Salmonella
- Salpingitis
- Samhainophobia
- Sand Flea Bites
- Sandhoff Disease
- Sandifer Syndrome
- Sanfilippo Syndrome
- Sarcoidosis
- Sarcoma
- Sarcomatoid Carcinoma
- Sarcopenia
- Scabies
- Scalp Pimples and Acne
- Scalp Psoriasis
- Scalp Yeast Infection
- Scaphocephaly (Sagittal Craniosynostosis)
- Scaphoid Fracture
- Scapholunate Dissociation
- Scarlet Fever
- Scarring Alopecia
- Scars
- Schistosomiasis
- Schizencephaly
- Schizoaffective Disorder
- Schizoid Personality Disorder
- Schizophrenia
- Schizophreniform Disorder
- Schizotypal Personality Disorder
- Schwannoma
- Schwannomatosis
- Sciatica
- Scimitar Syndrome
- Scleritis
- Scleroderma
- Sclerosing Mesenteritis
- Scolionophobia
- Scoliosis
- Scorpion Stings
- Scotoma
- Scrofula
- Scurvy
- Seasonal Depression
- Sebaceous Carcinoma
- Sebaceous Filaments
- Sebaceous Hyperplasia
- Seborrheic Dermatitis
- Seborrheic Keratosis
- Secondary Cough Headache
- Secondary Hypertension
- Secondary Infertility
- Segmental Fracture
- Seizure
- Selective IgA Deficiency
- Selective Mutism
- Selenophobia
- Self-Harm
- Semen Allergy
- Seminoma
- Sensorineural Hearing Loss
- Separated Shoulder
- Separation Anxiety
- Separation Anxiety Disorder
- Sepsis
- Sepsis in Newborns
- Septate Hymen
- Septate Uterus
- Septic Arthritis
- Septic Shock
- Septicemia
- Serotonin Syndrome
- Serrated Polyps
- Serum Sickness
- Sesamoiditis
- Sever’s Disease
- Severe Acute Respiratory Syndrome (SARS)
- Severe Combined Immunodeficiency (SCID)
- Sex Addiction, Hypersexuality and Compulsive Sexual Behavior
- Sexual Dysfunction
- Sexually Transmitted Fungal Infection (TMVII)
- Sexually Transmitted Infections
- Sézary Syndrome
- Shaken Baby Syndrome
- Shift Work Sleep Disorder (SWSD)
- Shigella Infection (Shigellosis)
- Shin Splints
- Shingles
- Shone’s Complex
- Short Bowel Syndrome in Children
- Short Q-T Syndrome (SQTS)
- Short Sleeper Syndrome (SSS)
- Shoulder Arthritis
- Shoulder Bursitis
- Shoulder Dystocia
- Shoulder Fracture
- Shoulder Impingement
- Shoulder Sprains
- Shprintzen-Goldberg Syndrome
- Shwachman-Diamond syndrome (SDS)
- Shy Bladder Syndrome (Paruresis)
- SIADH (Syndrome of Inappropriate Antidiuretic Hormone Secretion)
- Sialadenitis
- SIBO
- Sick Sinus Syndrome
- Sickle Cell Anemia
- Sickle Cell Crisis
- Sickle Cell Disease
- Sideroblastic Anemia
- SIDS
- Signet Ring Cell Carcinoma
- Silent Aspiration
- Silent Heart Attack
- Silent Migraine
- Silent Sinus Syndrome
- Silicosis
- Sinding-Larsen-Johansson Syndrome
- Sinus Arrhythmia
- Sinus Bradycardia
- Sinus Headaches
- Sinus Infection (Sinusitis)
- Sinus Tachycardia
- Sinus Tarsi Syndrome
- SIRS (Systemic Inflammatory Response Syndrome)
- Situs Inversus
- Sixth Nerve Palsy
- Sjögren’s Syndrome
- Skeeter Syndrome
- Skene’s Gland Cyst
- Skew Foot
- Skin Cancer
- Skin Cancer on Ear
- Skin Conditions in Children
- Skin Diseases
- Skin Fungus
- Skin Lesions
- Skin Rash
- Skin Tags (Acrochordons)
- Skull Fracture
- SLAP Tear
- Sleep Anxiety
- Sleep Apnea
- Sleep Deprivation
- Sleep Disorders
- Sleep Paralysis
- Sleep-Related Eating Disorders
- Sleepwalking
- Slipped Capital Femoral Epiphysis (SCFE)
- Slipping Rib Syndrome
- Small Cell Lung Cancer
- Small Fiber Neuropathy
- Small Intestine Cancer
- Smallpox
- Smegma
- Smith Fracture
- Smith-Magenis Syndrome
- Smoldering Multiple Myeloma
- SMV Thrombosis
- Snake Bites
- Sneddon Syndrome
- Snoring
- Social Anxiety Disorder (Social Phobia)
- Soft Palate Cancer
- Soft Tissue Sarcoma
- Solar Retinopathy
- Solitary Fibrous Tumors
- Solitary Rectal Ulcer Syndrome
- Somatic Symptom Disorder in Adults
- Somniphobia (Fear of Sleep)
- Somogyi Effect
- Sore Throat (Pharyngitis)
- Sotos Syndrome
- Soy Allergy
- Spasmodic Dysphonia
- Speech Impairment (Speech Disorder)
- Spermatocele
- Sphincter of Oddi dysfunction
- Spider Angioma
- Spider Bites
- Spider Veins
- Spigelian Hernia
- Spina Bifida
- Spina Bifida Occulta
- Spinal Arteriovenous Malformation (AVM)
- Spinal Arthritis
- Spinal Cord Injury
- Spinal Headaches
- Spinal Hemangioma
- Spinal Metastasis
- Spinal Muscular Atrophy (SMA)
- Spinal Stenosis
- Spinal Stroke
- Spinal Tumors
- Spindle Cell Lipoma
- Spindle Cell Sarcoma
- Spinocerebellar Ataxia
- Spiral Fracture
- Spitz Nevus
- Spitzoid Melanoma
- Spleen Cancer
- Splenic Artery Aneurysm
- Splenic Infarction
- Splinter Hemorrhage
- Spondyloarthritis (Spondyloarthropathy)
- Spondyloepiphyseal Dysplasia Congenita
- Spondylolisthesis
- Spondylolysis
- Spontaneous Coronary Artery Dissection (SCAD)
- Sports Hernia
- Sports Injuries
- Sprained Ankle
- Sprained Thumb
- Sprained Wrist
- Sprains
- Squamous Cell Carcinoma
- Squamous Intraepithelial Lesion (SIL)
- Squamous Metaplasia
- Stable Angina
- Staghorn Calculus
- Staph Infection
- Stargardt Disease
- Status Asthmaticus
- Status Epilepticus
- Status Migrainosus
- Steatotic (Fatty) Liver Disease
- STEMI Heart Attack
- Stenosis or Stricture
- Stereotypic Movement Disorder
- Stevens-Johnson Syndrome
- Stickler Syndrome
- Stiff Person Syndrome
- Still’s Murmur
- Stillbirth
- Stockholm Syndrome
- Stokes-Adams Syndrome
- Stomach Cancer
- Stomach Flu
- Stomach Polyps
- Stomach Ulcer
- Stomatitis
- Stork Bite
- Strabismus
- Strawberry Hemangiomas
- Strep Throat
- Stress
- Stress Fractures
- Stress Incontinence
- Stretch Marks
- Stridor
- Stroke
- Strongyloidiasis
- Structural Heart Disease
- Stubbed Toe
- Sturge-Weber Syndrome
- Stuttering
- Stye
- Subacute Cutaneous Lupus (SCLE)
- Subarachnoid Hemorrhage (SAH)
- Subclavian Artery Stenosis
- Subclavian Steal Syndrome
- Subclinical Hyperthyroidism
- Subclinical Hypothyroidism
- Subconjunctival Hemorrhage
- Subcutaneous Fat
- Subdural Hematoma
- Subgaleal Hemorrhage in Newborns
- Subglottic Stenosis
- Submucous Cleft Palate
- Substance Use Disorder (SUD)
- Subungual Hematoma
- Subungual Melanoma
- Sudden Arrhythmic Death Syndrome
- Sudden Cardiac Death
- Sudden Cardiac Death (Sudden Cardiac Arrest)
- Sulfa Allergy
- Sulfite Sensitivity
- Summer Penile Syndrome
- Sun Allergy
- Sun-damaged Skin
- Sunburn
- Superbug
- Superfetation
- Superficial Thrombophlebitis
- Superior Canal Dehiscence Syndrome
- Superior Vena Cava Syndrome
- Supraventricular Tachycardia (SVT)
- Susac Syndrome
- Sweet Syndrome
- Swimmer’s Shoulder
- Swimmer’s Ear (Otitis Externa)
- Swimmer’s Itch (Cercarial Dermatitis)
- Swine Flu (H1N1)
- Swollen Gums
- Swollen Lymph Nodes in the Groin
- Swollen Taste Buds
- Swyer Syndrome (XY Gonadal Dysgenesis)
- Sydenham Chorea
- Symblepharon
- Symbrachydactyly
- Symphysis Pubis Dysfunction
- Syncope
- Syndactyly
- Synechiae
- Synovial Osteochondromatosis
- Synovial Sarcoma
- Synovitis
- Syphilis
- Syringoma
- Syringomyelia
- Systemic Mastocytosis
- Systolic Heart Failure
- Systolic Heart Murmur