There are two main reasons for elevated blood pressure when having a headache during bowel movement, physiological elevated blood pressure and possibly hypertension. 1. Physiological blood pressure: due to constipation caused by dry stools difficult to discharge, patients often need to increase the abdominal pressure during defecation effort to discharge stools, this time the excessive force will cause a transient increase in blood pressure, causing headache symptoms. You can eat more food rich in dietary fiber, drink more water, strengthen the movement and other ways to maintain smooth stool, improve defecation difficulties and defecation of the situation, so that when defecation blood pressure will not rise sharply to headache. 2. High blood pressure: need to be alert to the patient usually have high blood pressure exists, a little force in the defecation of blood pressure rises more obvious will appear headache symptoms, you can monitor the usual blood pressure, if the usual blood pressure is also out of the normal range, should be alert to the existence of high blood pressure, need to go to the hospital in a timely manner to consult the doctor under the guidance of antihypertensive drugs treatment. Headache blood pressure rise when stool should go to the hospital in a timely manner, improve the examination, in the doctor’s help for treatment.