Pain in the back of the head after exercise may be related to sudden and excessive strenuous exercise. If you also have symptoms such as neck discomfort, stiff neck and shoulders or numbness in the hands and dizziness, it may be related to having cervical spine disease. Sudden movements or improper activities may cause headaches. Pain in the back of the head after exercise, if accompanied by nausea, vomiting or diarrhea, dizziness and other symptoms, may be related to heat stroke or gastrointestinal flu caused by exercise. If the blood pressure suddenly rises after strenuous exercise, the pain at the back of the head may also occur. Cerebrovascular diseases such as cerebral arteriosclerosis, cerebral infarction, cerebral thrombosis or mental stress or cold may cause headache after exercise. You should go to the hospital for examination to determine the cause before treatment.