Why is my head itching really bad? Itchy scalp can be really irritating and unsightly, it makes you go crazy and the irresistible impulse to scratch is almost impossible to disregard. Itchy scalp is very common and most people in the world suffer from an itchy scalp. 1. Dandruff - Most of the time the cause of itchy scalp is dandruff. Dandruff is a skin condition that mainly affects the scalp. It results to flaking and mild itchiness. Dandruff can be caused by irritated and oily skin or a yeastlike fungus (malassezia) that feeds on oils on the scalps of most adults. What can I put on my scalp to stop itching? (How to treat itchy scalp?) If you have dandruff the best solution is using a dandruff shampoo and scalp treatments. Here are some good itchy-scalp shampoo to relieve your itching: Nizoral Anti-Dandruff Shampoo Aveda Pramasana Purifying Scalp Cleanser, 5 Fl Oz Head & Shoulders Classic Clean Anti-Dandruff Shampoo Australian Bodycare Tea Tree Oil Treatment Shampoo A...