My body itches from head to toe what could be causing this?

Body itching ?'s: "Total body itching" may be due to delayed hypersensitivity to a long time use of laundry detergent ( specifically "Tide", for example). Use Ivory Snow for undergarments, bedclothes, etc) as it contains no detergents. Body itching can also of course come from specific food or medication allergies, so get a referral to a dematologist.