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  • Sleep apnoea

    Find out about sleep apnoea, which is when your breathing stops and starts while you sleep.

  • Slapped cheek syndrome

    Find out about slapped cheek syndrome (also called fifth disease), including symptoms and how to treat it.

  • Skin tags

    Find out about skin tags, including what they look like, when and where to get medical help and how they’re treated.

  • Skin cyst

    Find out about skin cysts, which are round, fluid-filled lumps under the skin. Read about the symptoms, treatments, types and causes.

  • Skin abscess

    Find out about skin abscesses, including how they look and feel, what treatment you may need, and what causes them.

  • Sjögren's syndrome

    Find out about Sjögren's syndrome, including the symptoms, things you can do to ease them, causes, how it's diagnosed and the treatment and support available.

  • Sinusitis (sinus infection)

    Find out about sinusitis (sinus pain), including the symptoms and treatments and when to get medical help.

  • Silicosis

    Find out about silicosis, a long-term lung disease caused by inhaling large amounts of crystalline silica dust, usually over many years.

  • Sickle cell disease

    Find out about sickle cell disease, a serious inherited blood disorder where the red blood cells develop abnormally. Find out about the symptoms, causes and treatments.

  • Sick building syndrome

    Find out about sick building syndrome (SBS), including symptoms, things you can do to ease symptoms and possible causes.