Headaches in the afternoon when you exercise are usually caused by physiological or pathological factors. Common pathological factors are: migraine, hypertension, cervical spondylosis, vegetative nerve disorders and so on. 1. Physiological factors: usually appear in the weaker, long-term non-exercise crowd. When exercising in the afternoon, the heart rate will increase and the output per beat will decrease, which will lead to a decrease in the blood flow to the brain from the heart, but the exercise will also cause an increase in the oxygen consumption of the brain, so the above groups of people will suffer from insufficient blood supply to the brain and lack of oxygen, resulting in headaches. 2. Tension-type headache: exercise leads to pericranial muscle or myofascial contraction or ischemia, inflammatory mediator release and other triggers. There are also factors such as depression and anxiety. Poor rest at noon is easy to fatigue, easily induced tension-type headache, headache symptoms in the afternoon. 3. Hypertension: If the afternoon workout is strenuous, it is easy to affect the normal pumping function of the patient’s heart, resulting in transient ischemia, hypoxia symptoms, headache performance. 4. Cervical spondylosis: exercise can cause compression of the intervertebral discs on the vertebral artery, thus affecting the normal blood flow and affecting the state of blood supply to the brain, and then the symptoms of headache. 5. Vegetative nerve disorders: usually due to long-term mental stress and lack of sleep. When you exercise in the afternoon, the blood supply to the brain will be insufficient, resulting in headache symptoms. If you have a headache when you exercise in the afternoon, it is recommended that you consult a doctor in a timely manner for a clear examination and active treatment.