After mixed hemorrhoid surgery, the causes of foreign body sensation in the anus for 17 days include postoperative thrombosis, postoperative occurrence of edema, scar proliferation and other causes. Mixed hemorrhoid surgery may appear after the local blood circulation obstruction, blood flow obstruction is easy to form a thrombus, the patient may be manifested as a foreign body sensation in the anus. After mixed hemorrhoid surgery due to improper ligation will appear blood reflux obstruction, blood stagnation in the vicinity of the anus will cause perianal edema, the patient will also appear in the anus of foreign body sensation phenomenon. Mixed hemorrhoid surgery will appear in the healing process of scar proliferation, will cause anal itching and foreign body sensation, with time will gradually ease. If you have a foreign body sensation in the anus after mixed hemorrhoid surgery, it is recommended that you go to the hospital in time to find out the cause of the disease, and receive standardized and reasonable treatment under the guidance of the doctor, so as to avoid delaying the condition.