Another name for itching, it is a common symptom with many causes. It may accompany obvious skin disease such as URTICARIA, eczema (see DERMATITIS) or SCABIES. Pruritus may also be caused by advanced liver or kidney failure, uncontrolled DIABETES MELLITUS, or HYPERTHYROIDISM. It may be due to drugs and certain forms of malignancy – for example, Hodgkin's disease (see LYMPHOMA). Anxiety or depression may also cause pruritus. Pruritus ani, itching round the ANUS, is a common troublesome condition: it may be caused by obsessive efforts to keep this area clean but a weak anal sphincter, skin tags, and HAEMORRHOIDS may also cause itching.
The first aim is to identify and treat the cause, whether local or systemic. Once the cause has been dealt with, symptomatic treatment may be required to break the cycle of itching, scratching and itching; topical steroid ointments and occlusive dressings help to prevent scratching. For dry skin, emollients (see OINTMENTS) are useful. Local anaesthetics (see under ANAESTHESIA) provide relief but may cause allergic reactions, and systemic ANTIHISTAMINE DRUGS at night can help.