If a patient has pain in the back of the head after strenuous exercise, there may be several reasons: First, if the pain in the back of the head is very severe, accompanied by jet-like nausea and vomiting, it is considered to be caused by cerebrovascular rupture and bleeding after exercise, so it is necessary to promptly consult a doctor for examination and treatment. Secondly, if the patient sweats a lot during intense exercise without timely replenishment of water, it may also lead to spasm of the cerebral blood vessels, which may cause pain in the back of the head, and the patient may also experience dizziness. Thirdly, the pain in the back of the head after strenuous exercise may also be related to cervical spondylosis, which is caused by the sudden excessive strenuous exercise, resulting in the strain on the muscles of the neck and shoulders, resulting in pain in the back of the head, accompanied by neck discomfort, neck and shoulder stiffness or hand numbness and dizziness.