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  • Sciatica

    Find out more about sciatica, a pain caused by irritation or compression of the sciatic nerve, including the symptoms, what you can do to ease the pain, and when to get medical help.

  • Schistosomiasis (bilharzia)

    Read about schistosomiasis, also known as bilharzia, an infection caused by a parasitic worm that lives in fresh water in subtropical and tropical regions.

  • Scars

    Find out about scars, including types of scars, things you can do to improve how a scar looks, and treatments that may be recommended if a scar is severe.

  • Scarlet fever

    Find out about scarlet fever, including the symptoms, what to do if you or your child has it, how it's treated, how long it lasts and how it's spread.

  • Scabies

    Find out about scabies, including symptoms, causes and treatments.

  • Sarcoidosis

    Sarcoidosis is a rare condition that causes small patches of swollen tissue, called granulomas, to develop in the organs of the body.

  • Salivary gland stones

    Read about salivary gland stones (calculi), which are small stones that can form in your mouth. Find out how to try to remove them and when to get medical help.

  • Reye's syndrome

    Find out about Reye's syndrome, including what the symptoms are, when to get medical help, how it's treated and how to prevent it.

  • Rett syndrome

    Read about Rett syndrome, a rare genetic disorder that affects brain development and causes severe physical and mental disability from early childhood.

  • Restless legs syndrome

    Find out what restless legs syndrome (RLS) is, what causes it, and how it can be treated.