There are many causes of elevated blood pressure. If the cause is primary hypertension, no exact cause can be found, but it is mainly related to arteriosclerosis, especially long-term heavy smoking, alcohol consumption, obesity, hyperlipidemia, which may lead to an increase in blood pressure; long-term tension, anxiety, high work pressure, sympathetic nerve activity, will cause an increase in blood pressure. Certain diseases can cause an increase in blood pressure, such as hyperthyroidism, which is sympathetically active all the time and can lead to an increase in blood pressure. Certain diseases, especially kidney disease, acute and chronic glomerulonephritis, acute and chronic pyelonephritis, tumors of the kidney, kidney stones, renal artery stenosis, aortitis, primary aldosteronism, pheochromocytoma, and cortisolism, may cause an increase in blood pressure.