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  • Wolff-Parkinson-White syndrome

    Find out about Wolff-Parkinson-White (WPW) syndrome, a heart condition that can cause the heart to beat abnormally fast. Find out about the symptoms, causes and treatments.

  • What to do if someone has a seizure (fit)

    Find out what you can do to help if you see someone having a seizure or fit.

  • Weight loss surgery

    Find out about the different types of weight loss surgery, what surgery involves and when it might be recommended.

  • Vitamins and minerals

    Find out about common vitamins and minerals, including what they do, how much you need, and how to ensure you get enough.

  • Vaginal bleeding between periods or after sex

    Find out about bleeding between periods or after sex, including what causes it and when to get medical help.

  • Undescended testicles

    Undescended testicles are a common childhood condition where a boy's testicles are not in their usual place in the scrotum. It's estimated that about 1 in every 25 boys are born with undescended testicles.

  • Ultrasound scan

    An ultrasound scan, sometimes called a sonogram, is a procedure that uses high-frequency sound waves to create an image of part of the inside of the body.

  • Twitching eyes and muscles

    NHS information about common causes of twitches in your eyes or muscles and advice about what to do.

  • Turner syndrome

    Turner syndrome is a genetic disorder that only affects females. It causes a wide range of symptoms and some distinctive characteristics.

  • Tuberous sclerosis

    Tuberous sclerosis, also known as tuberous sclerosis complex, is a rare genetic condition that causes mainly non-cancerous (benign) tumours to develop in different parts of the body.