According to the American Heart Association, 90 percent to 95 percent of high blood pressure cases cannot be held to a specific cause. However, after surgery, there are several reasons why a patient's blood pressure would rise.

Stress

Stress can play a large role in the raising of blood pressure after a patient has surgery. Having to adjust after surgery can cause a lot of stress on patients, which has been known to cause high blood pressure.

Medication

The medications to which you are prescribed after your surgery may also cause high blood pressure. You should check with your doctor to see if there is a different medication that you can take.

Lack of Exercise

Exercise is often recommended for the average person who has high blood pressure. If you are not able to exercise because of your surgery, this could cause a rise in blood pressure.

Pain

If you are suffering from a lot of pain because of your surgery, your blood pressure may rise. Pain can be a stressor for your body and stress causes high blood pressure.

Treatment

If you have high blood pressure after surgery, you will want to check with your surgeon about your options. Do not ignore high blood pressure because it can lead to a stroke.