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  • Non-Hodgkin lymphoma

    Non-Hodgkin lymphoma is an uncommon cancer that develops in the lymphatic system, which is a network of vessels and glands spread throughout your body.

  • Non-allergic rhinitis

    Find out more about non-allergic rhinitis, including what the symptoms are, what you can do about it and when to get medical help.

  • Non-alcoholic fatty liver disease (NAFLD)

    Non-alcoholic fatty liver disease (NAFLD) is caused by a build-up of fat in the liver. It often affects overweight or obese people. Although NAFLD doesn't usually cause serious problems, you should take steps to stop it getting worse.

  • Nipple discharge

    Find out about nipple discharge, including what can cause it and when to see a GP. It's usually nothing serious, but it's important to get it checked.

  • Neuromyelitis optica

    Find out about neuromyelitis optica (NMO), including what the symptoms are, how it's diagnosed, the causes and how it's treated.

  • Neurofibromatosis type 1

    Neurofibromatosis type 1 (NF1) is a genetic condition that causes tumours to grow along your nerves. The tumours are usually non-cancerous and so usually cause only mild symptoms.

  • Neuroendocrine tumours

    NHS information about neuroendocrine tumours (NETs) including symptoms, causes and treatments.

  • Necrotising fasciitis

    Find out about necrotising fasciitis, including what the symptoms are, when to get medical help, how it's treated and what causes it.

  • Neck pain

    Find out about neck pain or a stiff neck, which is a common problem and generally nothing to worry about.

  • Nasopharyngeal cancer

    Find out what nasopharyngeal cancer is, what the signs and symptoms are, what causes it, and how it's diagnosed and treated.