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  • Joint hypermobility syndrome

    Joint hypermobility syndrome is where you get pain and stiffness from having very flexible joints. Read more about how it's diagnosed and managed.

  • Jet lag

    Find out what causes jet lag and what you can do to reduce its effects. Get plenty of rest before you travel and try adjusting your sleep routine to the time zone of the place you're travelling to.

  • Jaundice

    NHS information about jaundice, where the skin and the whites of the eyes turn yellow. It's caused by a build-up of a substance called bilirubin.

  • Newborn jaundice

    Find out more about jaundice, a common and usually harmless condition in newborn babies that causes yellowing of the skin and the whites of the eyes.

  • Japanese encephalitis

    Find out about Japanese encephalitis including who's most at risk of getting it, how to avoid it, what the symptoms are and how it's treated.

  • Isovaleric acidaemia

    Isovaleric acidaemia (IVA) is a rare, but potentially serious, inherited condition. It means the body can’t process the amino acid leucine. This causes a harmful build-up of this substance in blood and urine.

  • Irritable bowel syndrome (IBS)

    Find out about IBS (irritable bowel syndrome), including what the symptoms are, what to do if you think you have it, how it is treated, and where to get support.

  • Iron deficiency anaemia

    Find out more about iron deficiency anaemia, including what the symptoms are, when to get medical help, the tests and treatments you may have, and the possible causes.

  • Intracranial hypertension

    Intracranial hypertension is a build-up of pressure around the brain. It can cause severe headaches and problems with your vision.

  • Bladder pain syndrome (interstitial cystitis)

    Find out about bladder pain syndrome (BPS), also called interstitial cystitis, where you have pelvic pain and problems peeing.