Dandruff can be a very embarrassing issue for many people. There are several possible causes for dandruff, including dry skin, not shampooing often enough, bacterial or fungal infections, skin inflammation, hormonal changes, reactions to stress, dietary deficiencies, and medical conditions. An imbalance of the scalp's production of oil and skin cells, coupled with a sensitivity to oils found in certain shampoos, can exacerbate dandruff. Therefore, it is important to discuss the reasons behind your dandruff with your doctor or dermatologist in order to address the cause and minimize symptoms.