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  • Long-sightedness

    Find out about long-sightedness, what the symptoms are, what tests you can have, how it is treated, and what causes it.

  • Long QT syndrome

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

  • Local anaesthesia

    Find out what local anaesthetics are, when they're used, and what the possible side effects are.

  • Lichen sclerosus

    Read about lichen sclerosus, a skin condition that mainly affects the skin of the genitals. Find out about symptoms, causes, treatments and when to see a GP.

  • Leg cramps

    Find out about leg cramps, a common condition where the muscles in the leg suddenly become tight and painful.

  • Laser eye surgery and lens surgery

    Find out what laser eye surgery and lens surgery are, why they're done, what happens during the operation and possible complications.

  • Laparoscopy (keyhole surgery)

    Find out more about laparoscopy, a type of keyhole surgical procedure that uses small cuts to perform surgery inside the tummy and pelvis.

  • Lambert-Eaton myasthenic syndrome

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

  • Knee ligament surgery

    Read about how an anterior cruciate ligament (ACL) injury is caused, and the considerations when deciding whether to have reconstructive surgery.

  • Klinefelter syndrome

    Read about Klinefelter syndrome - a condition in which male babies are born with an extra X chromosome. Find out about the symptoms, causes and treatments.