Stenosis after one and a half years of stenting may be caused by rejection reaction, or it may be caused by the reappearance of atherosclerosis. Stenosis after one and a half years of stenting may be due to the fact that the stent is a foreign body, after entering the human body for a period of time, the body may experience localized rejection reaction, and the patient may experience symptoms such as panic, chest tightness, shortness of breath, etc., which may prompt the patient to experience the phenomenon of stenosis again. In addition, if the patient has stenosis again after stenting, the endothelial cells in the patient’s body may be damaged to a certain extent over time after the surgery, and the blood lipids in the body may increase and be deposited under the endothelium, which may lead to the reoccurrence of arterial stenosis in the patient. If stenosis reoccurs one and a half years after stenting, patients should seek medical attention and follow the doctor’s instructions. It is recommended that patients avoid strenuous exercise to prevent aggravation of the condition after stenosis occurs, and patients should have follow-up examinations on a regular basis.