There are actually some drawbacks to minimally invasive hemorrhoid surgery which may include several types of procedures. For example, there can be perirectal infections, which can be more serious, and there are also the disadvantages of minimally invasive surgery in that some patients experience recurrence after minimally invasive hemorrhoid surgery. Overall, minimally invasive surgery includes many types, such as submucosal sclerotherapy injections for milder hemorrhoids, which can shrink the nucleus of the hemorrhoid, thus achieving treatment. However, with local sclerotherapy injections, localized rectal and perirectal infections, sometimes very serious, may occur due to the depth of the injection site and the infection of the intestinal flora, which is injected when there is a large amount of bacteria in the intestine. Also for hemorrhoids, treated by electrocoagulation, laser, freezing or infrared irradiation coagulation, the patient may experience future recurrence, in addition to bleeding, which may be more severe. Currently the most common surgical procedure used to treat mixed hemorrhoids is probably still external peel and tie.