Most itching comes from the skin itself: dryness, eczema, hives, contact with an irritant or allergen, a bug bite, or a rash.
What changes the answer is where you itch, whether you can see a rash, and how long it has lasted. Itching in one spot with a visible rash usually points to a skin cause such as eczema, ringworm, poison ivy, or scabies. Itching all over with normal-looking skin is more likely to come from a medicine you started, dry winter air, or a body-wide cause such as thyroid, liver, kidney, or blood conditions. Short lukewarm showers, fragrance-free moisturizer applied while your skin is still damp, gentle detergent, and a humidifier settle most everyday itching within a couple of weeks.
When itching needs a doctor
Common questions
why am i itchy
Itching usually starts in the skin. Dry skin from cold air, hot showers, harsh soap, or aging is the most common cause. Eczema, hives, contact with nickel or plants, scabies, ringworm, and bug bites also itch, and so do many rashes. Some medicines, including opioids and certain blood pressure drugs, cause itching with no rash at all. Widespread itching without a rash can come from thyroid, liver, or kidney conditions, iron problems, or pregnancy. Note where it itches, whether skin looks changed, and what is new in the last month. See a clinician if itching lasts over two weeks, wakes you at night, or covers your whole body.