Conditions beginning with the letter S
- SAD (Seasonal Affective Disorder)
- SARS (Severe Acute Respiratory Syndrome, Atypical Pneumonia)
- Scabies (Mite Infestation, Body Lice)
- Schizophrenia (Psychosis, Psychotic Disorders)
- Sciatica
- Scleroderma (Systemic Sclerosis, Morphea)
- Scoliosis (Spine Curvature, Spinal Curvature)
- Seasickness (Motion Sickness, Travel Sickness)
- Seasonal Affective Disorder (SAD)
- Seasonal Allergic Rhinitis (Hay Fever, Pollinosis)
- Secondary Polycythemia (Polycythemia, Polycythemia Vera, Primary Polycythemia)
- Senile Dementia (Dementia, Chronic Brain Syndrome, Organic Brain Syndrome)
- Senile Dementia (Alzheimer's Disease)
- Seventh Nerve Palsy (Bell's Palsy, Facial Paralysis, 7th Nerve Palsy)
- Severe Acute Respiratory Syndrome (SARS, Atypical Pneumonia)
- Severe Allergic Reaction (Anaphylaxis (severe allergic reaction))
- Sexual Dissatisfaction in Women (Female Sexual Dysfunction, Low Libido in Women, Decreased Sex Drive - Female)
- Sexually Transmitted Disease (Sexually Transmitted Infection, STI, STD)
- Sexually Transmitted Infection (STI, Sexually Transmitted Disease, STD)
- Shingles (Herpes Zoster, Varicella-Zoster)
- Sickle Cell Anemia (Hemoglobin S Disease, Sickle Cell Disease)
- Sickle Cell Disease (Sickle Cell Anemia, Hemoglobin S Disease)
- SIDS (Sudden Infant Death Syndrome, Cot Death, Crib Death)
- Sinus Headache (Headaches, Tension Headache, Migraine)
- Sinus Infection (Sinusitis)
- Sinusitis (Sinus Infection)
- Siriasis (Heat Stroke, Sunstroke, Heat Exhaustion)
- Sixth Disease (Roseola, Roseola Infantum, Exanthem Subitum)
- Sjögren's Syndrome
- Skin Burns (Burns)
- Skin Cancer (Melanoma, Cancer of the Skin, Skin Tumour)
- Skin Cancer (Basal Cell Cancer, Squamous Cell Cancer, Superficial Basal Cell Carcinoma)
- Skin Tumour (Melanoma, Skin Cancer, Cancer of the Skin)
- Slapped-Cheek Disease (Fifth Disease, Human Parvovirus B19, Erythema Infectiosum)
- SLE (Lupus, Systemic Lupus Erythematosus)
- Sleep Apnea
- Sleep Disorder (Insomnia, Trouble Sleeping, Sleep Problems)
- Sleep Problems (Insomnia, Sleep Disorder, Trouble Sleeping)
- Slipped Disc (Herniated Disc, Prolapsed Disc, Ruptured Disc)
- Smoking Cessation (Stopping Smoking, Quitting Smoking)
- Soft Bones (Osteomalacia, Rickets)
- Solar Erythema (Sunburn, Excess Sun)
- Solar Keratosis (Actinic Keratosis, Precancerous Skin Lesion)
- Sore Throat (Tonsillitis, Tonsilitis)
- Spastic Bowel (Irritable Bowel Syndrome, IBS, Functional Bowel Disorder)
- Spastic Colon (Irritable Bowel Syndrome, IBS, Functional Bowel Disorder)
- Spider Bites
- Spiderweb Veins (Varicose Veins, Leg Veins, Bulging Veins)
- Spina Bifida (Neural Tube Defect)
- Spinal Curvature (Scoliosis, Spine Curvature)
- Spine Curvature (Scoliosis, Spinal Curvature)
- Sports Injuries (Athletic Injuries)
- Squamous Cell Cancer (Skin Cancer, Basal Cell Cancer, Superficial Basal Cell Carcinoma)
- STD (Sexually Transmitted Infection, STI, Sexually Transmitted Disease)
- Stein-Leventhal Syndrome (Polycystic Ovary Syndrome, Chronic Hyperandrogenic Anovulation (CHA), PCOS)
- STI (Sexually Transmitted Infection, Sexually Transmitted Disease, STD)
- Stomach Cancer (Gastric Cancer)
- Stomach Flu (Gastroenteritis, Norwalk Virus, Norovirus)
- Stomach Ulcers (Peptic Ulcer Disease, Ulcers, Gastric Ulcers)
- Stopping Smoking (Smoking Cessation, Quitting Smoking)
- Strep (Strep Throat, Throat Infection, Streptococcal Pharyngitis)
- Strep Throat (Throat Infection, Strep, Streptococcal Pharyngitis)
- Streptococcal Pharyngitis (Strep Throat, Throat Infection, Strep)
- Stress Urinary Incontinence
- Stroke (Cerebrovascular Accident, Ischemic Stroke, Hemorrhagic Stroke)
- Styes (Hordeolum)
- Substance Use Problems (Drug Abuse, Addiction)
- Sudden Infant Death Syndrome (SIDS, Cot Death, Crib Death)
- Suicide
- Sunburn (Excess Sun, Solar Erythema)
- Sunstroke (Heat Stroke, Heat Exhaustion, Thermic Fever)
- Superficial Basal Cell Carcinoma (Skin Cancer, Basal Cell Cancer, Squamous Cell Cancer)
- Swimmer's Ear (Outer Ear Infection, Otitis Externa, Ear Infection)
- Swine Flu (Swine Influenza)
- Swine Flu (H1N1 Influenza, H1N1 Flu Virus, Influenza A (H1N1))
- Swine Influenza (Swine Flu)
- Syndrome X (Metabolic Syndrome, Insulin Resistance Syndrome)
- Syphilis
- Systemic Exertion Intolerance disease (SEID) (Chronic Fatigue Syndrome, Myalgic Encephalomyelitis (ME), Chronic Fatigue Immune Dysfunction Syndrome (CFIDS))
- Systemic Lupus Erythematosus (Lupus, SLE)
- Systemic Sclerosis (Scleroderma, Morphea)
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