89 yr old with right side of back itching, is it anxiety?

BACK ITCH: How long has this been going on? From your description, is sounds like it may be a condition known as notalgia paresthetica. Also called brachioradial pruritus. Have you had an injury to your neck before this began? Change your laundry detergent to all free & clear. Use an otc Hydrocortisone cream twice daily. See a dermatologist for this common disorder if it doesn't disappear.

Itching one side bac: Best bet is to examine the pt. Make sure there is no scabies or skin disorder, urticaria or something else.