Hair loss is very common in clinical practice and has many causes, not all of which are caused by zinc deficiency. For example, breastfeeding women, when the child is about 3-4 months old, there will be obvious hair loss, this is due to postpartum physical weakness, as well as hormonal changes in the body during breastfeeding, resulting in hair loss is more obvious. This is a physiological phenomenon, not a pathological phenomenon. With the extension of time, it will slowly get better and new hair will grow out. If it is a pathological hair loss, it may be due to hormonal abnormalities in the body, or due to excessive secretion of androgens leading to too much fat secretion in the hair follicles, which may lead to hair loss, and it is not necessarily due to zinc deficiency.