Some of the consequences this can cause are high blood pressure. Hypertension means that a person has high blood pressure (3). If a person has high blood pressure, it means that their blood has to pump blood through the body with a higher pressure than a person with normal blood pressure (3). The reason this happens is because water hangs in the body and causes the amount of blood in the arteries to increase, which also makes the smaller arteries smaller and blood flow needs to be increased. 'greater pressure to get through.