High blood pressure after six o’clock in the evening may be too salty dinner, improper use of antihypertensive drugs, circadian rhythm disorders and other factors. 1. Too salty dinner: If you eat too salty dinner, it may lead to increased osmotic pressure in the plasma, and then the water in the interstitial space of the tissues into the blood vessels, causing an increase in blood volume. Volume load is too heavy, may cause blood pressure to rise. Therefore, when the dinner is too salty, high blood pressure may occur after 6:00 pm. This can be done by adjusting the diet, such as eating less food with higher salt content. 2. Improper use of antihypertensive drugs: Antihypertensive drugs can be maintained for a period of time in the body, if the use of antihypertensive drugs with a shorter duration of action, may also appear after 6:00 p.m. high blood pressure. This can be done by adjusting the medication, such as using controlled-release or extended-release tablets. 3. Circadian dysrhythmia: When the circadian rhythm is dysrhythmic, the sympathetic nerves may become overexcited after 6:00 pm. Sympathetic arousal constricts blood vessels, so high blood pressure after 6 p.m. can also occur in circadian dysrhythmia. It can be treated with medications such as metoprolol, bisoprolol, captopril, etc. When the situation of high blood pressure after six o’clock in the evening occurs, you should consult a doctor in time, improve the relevant examination under the guidance of the doctor, clarify the cause of the disease, and actively treat it.