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  • High blood pressure (hypertension)

    Find everything you need to know about high blood pressure, including causes, symptoms, diagnosis and treatment, with links to other useful resources.

  • Coughing up blood

    Read about coughing up blood, including what can cause it and when to get medical help.

  • Blood transfusion

    Find out about blood transfusions, including when you might need one, how they're carried out and associated risks.

  • Blood tests

    Find out about blood tests, including why they’re done, how to prepare, what happens at the test, and when you’ll get your results.

  • Blood pressure test

    Find out why a blood pressure test is important, how it’s done and what your blood pressure reading might mean.

  • Blood in urine

    Find out about blood in urine (pee). It's not usually anything serious, but sometimes it can be, so you must get it checked out by a GP.

  • Blood in semen

    Find out about possible causes of blood in semen and when to get medical help.

  • Blood groups

    Find out about blood groups. There are 4 main blood groups – A, B, AB and O.

  • Blood clots

    Read about blood clots, their symptoms, when to get help and how to prevent them.

  • Bleeding from the bottom (rectal bleeding)

    Bleeding from the bottom (rectal bleeding) is often seen as small amounts of bright-red blood on toilet paper or pink water in the toilet. Find out when to get medical help if you keep bleeding from your bottom.