Hair loss can be caused by micronutrient deficiencies, as well as diseases such as seborrheic alopecia and baldness. 1. Deficiency of trace elements: Zinc, calcium, copper and iron in trace elements are important to maintain the health of hair. Iron can transport oxygen to the blood in the scalp, so the lack of these trace elements will lead to hair problems such as alopecia areata, yellowing of hair, and split ends. 2. Seborrheic alopecia: over secretion of androgens will produce testosterone and dihydrotestosterone, which combined with hair follicles will cause short hair growth cycle, and then hair on the top of the head will become thin and soft, so hair loss is formed. 3. Patches of baldness: autoimmune disease in which self-inflammatory cells or lymphocytes attack the hair follicles, resulting in hair loss over a period of time. If the symptoms of severe hair loss persist without relief, timely medical treatment is needed.