Understand more about gallbladder cancer, its symptoms, when to get medical help, testing and diagnosis, treatment and where to find help and support.
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.
Gastritis occurs when the lining of the stomach becomes inflamed after it's been damaged. It's a common condition with a wide range of causes.
Read about gastroparesis, a long-term (chronic) condition where the stomach can't empty itself of food in the normal way, causing food to pass through it slowly.
General anaesthesia is a state of controlled unconsciousness. During a general anaesthetic, medicines are used to send you to sleep, so you're unaware of surgery.
Read about Gilbert’s syndrome, a genetic hereditary disorder where slightly higher than normal levels of bilirubin build up in the bloodstream, causing jaundice.
Glutaric aciduria type 1 (GA1) is a rare but serious inherited condition. It means the body can’t process certain amino acids, causing a harmful build-up of substances in the blood and urine.
Read about granuloma annulare, a rash that often looks like a ring of small pink, purple or skin-coloured bumps.
Find out about granulomatosis with polyangiitis (GPA), including what the symptoms are, why it happens and how it's treated.
Growing pains are aches or pains, most commonly in the lower legs, that occur in the evening or at night and affect children aged between 3 and 12.
Read about gallbladder removal surgery (cholecystectomy), including why it's done, what's involved and what the potential risks are.
Gallstones are small stones, usually made of cholesterol, that form in the gallbladder. In most cases they do not cause any symptoms and do not need to be treated.
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.
Read about gastrectomy, a medical procedure that involves surgically removing all or part of the stomach. Find out how it is performed, the recovery and complications from having it.
A gastroscopy is a procedure where a thin, flexible tube called an endoscope is used to look inside the oesophagus (gullet), stomach and first part of the small intestine (duodenum).
Gender dysphoria is a term that describes a sense of unease that a person may have because of a mismatch between their biological sex and their gender identity.
Everyone has feelings of anxiety at some point in their life. However, some people find it hard to control their worries. Their feelings of anxiety are more constant and can often affect their daily lives.
Genital herpes is caused by the herpes simplex virus (HSV) type 1 or type 2. It causes painful blisters to appear on the genitals and the surrounding areas.
Genital warts are small fleshy growths, bumps or skin changes that appear on or around the genital or anal area.
Find out what gestational diabetes is, what problems it can cause, how it's diagnosed, and what the treatments are.
Read about giardiasis, an infection of the digestive system caused by tiny parasites called Giardia intestinalis.
Read about glandular fever, which is a type of viral infection that mostly affects young adults. Find out what the symptoms are, what you can do to treat it yourself and when to get medical help.
Find out what glaucoma is, what the symptoms are, why it happens and how it's treated.
Read about glomerulonephritis, which is damage to the tiny filters inside your kidneys (the glomeruli).
Find out what glue ear is, what causes it, what a GP can do to help, and how it's treated in hospital.
Read about a goitre (sometimes spelled "goiter"), an abnormal swelling of the thyroid gland that causes a lump to form in the neck.
Gonorrhoea is a sexually transmitted infection (STI) caused by bacteria called Neisseria gonorrhoeae or gonococcus. It used to be known as 'the clap'.
Gout is a type of arthritis where crystals form inside and around joints, causing pain. Read about the symptoms, causes and treatments.
Guillain-Barré syndrome is a very rare and serious condition that affects the nerves. It mainly affects the feet, hands and limbs, causing problems such as numbness, weakness and pain.
Gum disease is a very common condition where the gums become swollen, sore or infected.
Find out about group B strep, a type of bacteria called streptococcal bacteria.
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.