The frequent urination at night after cardiac stent implantation may be caused by using diuretics, drinking too much water, or hypertensive nephropathy. 1. Diuretics: Usually after cardiac stent implantation, some patients may need to choose diuretics for treatment, such as hydrochlorothiazide, which can enhance the vascular renin activity and aldosterone secretion, thus leading to an increase in urine output. This is a normal drug reaction, usually after stopping the drug, the symptoms of increased nocturia will gradually disappear. 2. Drinking too much water: If you drink a lot of water before going to bed after stent implantation, it will lead to excess fluid in the body and increase nocturia at night. This is a normal physiological phenomenon, usually do not need to worry about, and do not need special treatment, after reducing the amount of water, the symptoms will disappear. 3. Hypertensive nephropathy: If there is a history of hypertension, it may be due to uncontrolled elevated blood pressure, resulting in kidney damage, mainly caused by glomerular and tubular damage. This causes damage to the glomerular filtration membrane, resulting in a decreased filtration rate, as well as changes such as decreased concentration and reabsorption in the renal tubules. The situation of excessive urination at night after cardiac stent. It is recommended to consult a doctor in time and standardize the treatment after clarifying the cause of the disease under the guidance of the doctor.