When your scalp itches, it can be difficult to think about anything else. You may feel that the itch will never stop, but relief is possible. Getting rid of the itch begins with finding out why your scalp itches. Here are 10 reasons for an itchy scalp along with dermatologists’ advice on what can bring relief.Reaction to a hair care product. An itchy, dry, and flaky scalp could be telling you that you need to do a better job of rinsing the shampoo from your hair. Leaving some shampoo on your scalp can irritate it.