A wide variety of factors can cause hypogeusia. Heavy smoking, dehydration, radiation therapy administered to the neck or head, or burns to the tongue that damage the taste buds can all cause a diminished sense of taste. The use of certain prescription drugs, such as antidepressants, can cause hypogeusia as well. In addition, other medical conditions can cause hypogeusia including Bell's palsy, Sjogren's syndrome, and depression. Nutritional deficiencies can also contribute to hypogeusia.