Pruritus without rash: Causes / Differential Mnemonic

ITCHING DX:

Infections (scabies, toxocariasis, etc)
Thyroidal and other endocrinopathies (eg diabetes mellitus)
Cancer
Hematologic diseases (eg iron deficiency)/ Hepatopathies/ HIV
Idiopathic
Neurotic
Gravid (pruritus of pregancy)
Drugs
eXcretory dysfunctions (eg uremia)