Itch

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What is itch?

Itch, also known as pruritus, is a feeling of uncomfortability, only momentarily relieved by contact such as scratching. It is a common dermatological complaint, although can occasionally be a sign of something more serious.

Skin causes

• Dry skin
• Eczema
• Contact dermatitis
• Psoriasis
• Urticaria

However, almost all skin conditions can present with itching

Systemic causes

• Chronic renal failure
• Jaundice
• Diabetes
• Leukaemia
• Lymphoma

There are others, including anaemia and thyroid and neurological problems.

Examination

• Look for a rash
• Look for signs of liver failure
• Hepatosplenomegaly
• Enlarged lymph nodes

Investigations

You would usually do these to exclude the more serious causes

• Blood tests - FBC, U&Es, LFTs, Fasting Glucose, Ferritin, TFTs, ESR
• Chest Xray