If the furrow at the back of the head occurs over a long period of time and is gradual, it may be caused by obesity, and the furrow at the back of the head caused by obesity is hereditary in the family, and is normal if there is no specific discomfort. If the formation of the groove at the back of the head is short-term, it should be considered whether it is due to the relaxation of the skin muscles of the head, possibly due to seborrheic dermatitis. And it may be due to local muscle spasm caused by cervical spine related diseases, and this condition may cause discomfort in the neck as well as in the skin of the back of the head. For normal cases, there are no special clinical symptoms of discomfort, and the grooves at the back of the head can be eliminated by weight loss. If there are specific clinical manifestations, it may be considered to be caused by diseases related to obesity, such as hypertension and cerebrovascular diseases.