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  • Lyme disease

    Read NHS information on Lyme disease, which is a bacterial infection spread to humans by infected ticks.

  • Lumbar decompression surgery

    Lumbar decompression surgery is a type of surgery used to treat compressed nerves in the lower (lumbar) spine. It's only recommended when non-surgical treatments haven't helped.

  • Low sex drive (loss of libido)

    A low sex drive (loss of libido) can affect both men and women. Find out what can cause it, when to get help and how it can be treated.

  • Long QT syndrome

    NHS information about long QT syndrome, including symptoms, causes and treatments.

  • Liver disease

    Find out about the different types of liver disease and their causes . Find out the symptoms of liver disease, when to get medical help and what you can do to prevent it.

  • Leptospirosis (Weil's disease)

    Find out about leptospirosis infection, including what causes it, what the symptoms are, where to get help, how it's treated, and how to avoid getting it.

  • Legionnaires' disease

    Find out more about Legionnaires' disease, an uncommon but serious lung infection you can get from inhaling droplets of water containing bacteria that cause the infection.

  • Learning disabilities

    A learning disability affects the way a person learns new things throughout their lifetime.

  • Lactate dehydrogenase (LDH) test

    A lactate dehydrogenase (LDH) test measures the amount of LDH in the blood.

  • Lambert-Eaton myasthenic syndrome

    Find out about Lambert-Eaton myasthenic syndrome, a rare condition affecting the nerves that causes muscle weakness and other symptoms.