A 3-centimeter thrombus inside a hemorrhoid may belong to thrombosed internal hemorrhoids, which generally require stripping from the inside. If it belongs to thrombosed internal hemorrhoids, you can consider thrombectomy, which requires stripping from the inside, and the surrounding abnormally dilated blood vessels should be stripped during the stripping process, and they need to be excised if necessary, so as not to cause adverse reactions due to the continuous enlargement. In addition to thrombectomy, modified thrombectomy can also be used, which mainly involves removing the thrombus and the dilated blood vessels on top of removing the relevant tissues, and should be decided in light of the severity of thrombosed internal hemorrhoids. When thrombosed internal hemorrhoids are found, it is recommended to go to the hospital in time for examination to clarify the condition and choose the appropriate surgical plan with the doctor’s advice.