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  • Supraventricular tachycardia (SVT)

    Read more about supraventricular tachycardia (SVT), which is a condition where your heart suddenly beats much faster than normal. SVT is not usually serious but some people may need treatment.

  • Support for people who may have been affected by infected blood

    Find help and support for people affected by infected blood, blood products or an organ transplant before 1996. Support is available for those affected, their families and anyone who is worried they might be affected.

  • Sunburn

    Find out about sunburn, including what you can do to treat it yourself and when to get medical help.

  • Sudden infant death syndrome (SIDS)

    Sudden infant death syndrome (SIDS) – sometimes known as 'cot death' – is the sudden, unexpected and unexplained death of an apparently healthy baby.

  • Subdural haematoma

    Read about subdural haematoma, a serious condition where blood collects between the skull and the surface of the brain. Find out why it happens, what the symptoms are, and how it's treated.

  • Subarachnoid haemorrhage

    A subarachnoid haemorrhage is an uncommon type of stroke caused by bleeding on the surface of the brain. It's a very serious condition and can be fatal.

  • Stye

    Find out about styes, including what causes them, what you can do to treat them and when to see a GP.

  • Stretch marks

    Find out about stretch marks, including where, when and how you get them, what causes them, and how they can be treated and prevented.

  • Strep A

    Find out about strep A infections, including what the symptoms are, when to get medical help and how mild and severe strep A infections are treated.

  • Stop smoking treatments

    Find out about the medicines that can help if you want to stop smoking, including nicotine replacement therapy (NRT) and bupropion (Zyban).