The dangers of primary and secondary hypertension are serious, most notably causing damage to target organs, such as heart complications, kidney complications, and brain complications. The most important risk factor of hypertension is the damage to target organs. Primary hypertension and secondary hypertension mainly depend on the level of blood pressure. Primary hypertension is generally better regulated by medications, while secondary hypertension is relatively difficult to regulate by hypertension medications alone. Secondary hypertension is mainly treated by the primary disease, and the blood pressure will be better controlled by removing the primary cause.