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  • Genetic and genomic testing

    Find out about genetic and genomic testing on the NHS including how it works, when it's available, what the results can show and how genetic counselling can help.

  • General anaesthetic

    Find out about having a general anaesthetic, including how to prepare for it, what happens, recovery and side effects.

  • Gastroscopy

    Find out what a gastroscopy is, why it's done, what happens on the day and what the results mean.

  • Gastroparesis

    Find out about gastroparesis, including what the symptoms are, what the treatments are, how it's diagnosed, and what causes it.

  • Gastritis

    Find out about gastritis, including what the symptoms are, why it happens and how it's treated.

  • Gastrectomy

    Find out about gastrectomy, an operation to remove all or part of your stomach, including why it's done, what happens, possible complications and what to expect after the operation.

  • Gangrene

    Gangrene is a serious condition in which a loss of blood supply causes tissue to die. It can affect any part of the body but typically starts in the toes, feet, fingers and hands.

  • Ganglion cyst

    A ganglion cyst is a fluid-filled swelling that develops near a joint or tendon. The cyst can range from the size of a pea to the size of a golf ball.

  • Gallstones

    Gallstones are small stones, usually made of cholesterol, that form in the gallbladder. They do not usually cause any symptoms and do not need to be treated.

  • Gallbladder removal

    Read about gallbladder removal surgery (cholecystectomy), including why it's done, what's involved and what the potential risks are.