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Diseases and Conditions

Find doctor-approved information about symptoms, causes, diagnosis, treatment and prevention of common diseases and conditions.

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  • Syphilis

    Syphilis is a serious infection passed from one person to another through sexual contact. It is caused by a bacteria…

  • Sudden Infant Death Syndrome (SIDS)

    Sudden infant death syndrome is the unexplained reason a baby under 1 year old dies while sleeping. There are no…

  • Substance Abuse

    Substance abuse can happen when products aren’t used in the right way. Prescription medicines, illegal drugs, tobacco, and alcohol can…

  • closeup of a sty on a child’s eye

    Sty

    A sty is a painful, red bump that forms on the edge of your eyelid. It may look like an…

  • Stuttering

    Stuttering is a condition that affects a person’s ability to speak smoothly. It can cause them to repeat words, parts…

  • senior man receives injection from medical worker with gloved hands

    Stroke

    Stroke is a medical condition that occurs when the blood flow to your brain stops. It can lead to serious…

  • Doctor checking woman’s throat with a tongue depressor

    Strep Throat

    Strep throat is an infection caused by bacteria. It is called “strep” because the bacteria that causes the infection is…

  • Strabismus

    Strabismus is an eye disorder. It affects the muscle control in your eyes. The eyes don’t line up properly. Instead,…

  • Woman sitting on a couch holding stomach in pain

    Stomach Flu (Gastroenteritis)

    Gastroenteritis is a medical term for a stomach virus. Many people call it the stomach flu. It can strike anyone…

  • Stomach Cancer

    Stomach cancer is the growth of cancer cells in the lining and wall of the stomach. It’s also called gastric…

  • Dermatologist uses magnifying glass to examine a mole on the back of a male patient

    Squamous Cell Carcinoma

    Squamous cell carcinoma is a common form of skin cancer caused by too much exposure to ultraviolet (UV) radiation.

  • View of a man’s spinal column through the back of his shirt

    Spinal Cord Injury

    Common causes of spinal cord injury include falling, sports-related events, car accidents, and diseases such as polio or spina…

  • Spina Bifida

    Spina bifida is a birth defect that happens when a baby’s spine and spinal cord don’t close completely during…

  • Mother and child play with stacking cups

    Speech and Language Delay

    A speech and language delay is when your child doesn’t talk as much as most other children their age.

  • Sore Throat

    A sore throat means that your throat hurts. It feels irritated or scratchy. You may feel mild discomfort or burning…

  • A man who doesn't feel well is sitting on top of his bed with his head in his hand

    Somatic Symptom and Related Disorders

    Somatic symptom and related disorders is a group of conditions in which the physical pain and symptoms a person feels…

  • Anxious young business man looking away

    Social Phobia

    Social phobia is an irrational fear of being judged by others during social situations.

  • Close-up of a narrowed small blood vessel

    Small Vessel Disease

    Small vessel disease is a narrowing in the tiny arteries in your heart. It also is called coronary microvascular disease…

  • Slipped Capital Femoral Epiphysis

    Slipped capital femoral epiphysis is a hip problem. It starts if the growing end of the thigh bone slips from…

  • Sleepwalking

    Learn about the causes of and ways to deal with sleepwalking.

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