There is a very broad<unk>  diagnosis for itching due to an extensive list of possible causes. Itching may be due to dermatologic disease, systemic disease, reactions to chemicals and medications, weather, or psychiatric disease. Symptoms, laboratory findings and other diagnostic tests can help narrow down the list.
Itch differential diagnosis
Boil differential diagnosis
Itch causes
Disease Name differential diagnosis
Itch epidemiology and demographics
Clubbing differential diagnosis
Phobia causes
How to create an algorithm