Thyroid alopecia areata is a type of alopecia that is caused by a thyroid disorder or disease. Just like the other types of hair loss, this condition is not limited to any age or sex. High percentage of people who have any problem with thyroid gland will be affected with some type of alopecia areata. This hair loss usually occurs in the form of patches. Hair may be lost in a localized area (monolocularis) or in several areas on the head (multilocularis).