A-Z of conditions and treatments

Genetic conditions are caused by an altered or faulty gene or set of genes.

Familial hypercholesterolaemia is an inherited condition characterised by higher than normal levels of blood cholesterol.

Genetic services can help people who are affected by, or who are at risk of, inherited conditions or birth defects, to make informed choices about their healthcare.

A predisposition to certain cancers can be inherited via altered genes.

Genital herpes is common and may not cause symptoms. More on causes, transmission, symptoms, reinfections, diagnosis, treatment, prevention, pregnancy and where to get support.

Genital warts are a common sexually transmissible infection (STI). About causes, signs, symptoms, transmission, treatment, reinfection, prevention, HPV vaccines, cervical cancer screening and support.

Gilbert's syndrome and hepatitis both cause jaundice but are not related.

Glandular fever is most common among high school and university students, but young children can also become infected by saliva on toys, shared cups, or the hands of carers.

Symptoms of a goitre can include enlargement of the throat, swallowing problems and breathing problems.

Gonorrhoea, also spelt gonorrhea, affects both men and women and is transmitted during sex, it may lead to infertility in women if left untreated.