liver disease - symptom of biliary obstruction, may be the presenting feature in primary biliary cirrhosis or drug-induced cirrhosis
chronic renal failure
thyroid disease - hypo- or hyperthyroidism
carcinomatosis (especially bronchial)
iron deficiency
diabetes mellitus
parasites:
onchocerciasis
schistosomiasis
lymphoma - may be the presenting feature in Hodgkin's disease
pregnancy (pruritus gravidarum) - some women develop pruritus during pregnancy, usually in the later stages but possibly, as early as the third month. Often attributed to oestrogens
pre-eruptive herpes zoster
Reference:
Sheretz EF et al (1992). Skin reactions to systemic disease. Medicine International, 102:4278-81.
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