The causes of pain in the back of the head every afternoon are as follows: First, it is caused by increased blood pressure, especially in hypertensive patients due to unsatisfactory blood pressure control in the afternoon, resulting in pain in the back of the head, accompanied by head swelling, patients are advised to monitor their blood pressure and take additional antihypertensive drugs if necessary; Second, pain in the back of the head every afternoon is clinically seen in some patients with cervical spondylosis, especially those who work at a desk, due to protruding neck after working for a long time in the morning. The dural sac and nerve roots are stimulated by the intervertebral discs, resulting in soreness in the back of the head, accompanied by dizziness and numbness of both upper limbs in severe cases; third, daily afternoon pain in the back of the head is also seen clinically in some patients with migraine, who have a history of recurrent headache attacks, triggered by acute attacks of migraine due to work pressure, fatigue and cold.