9 years ago, I was once constipated, for about a week, I tried to go, then there was a protrusion of the anus, I thought it was hemorrhoids. So the doctor asked me if the protruding anus is hemorrhoids? Severe abdominal pain after drinking milk is what disease? Thank you doctor!

External hemorrhoid occlusion is a condition in which a vein is blocked, ruptures and bleeds to form blood clots, causing pain, inflammation in the anus due to external hemorrhoids, even anal necrosis, causing a high risk of rectal cancer. colon if not detected early and treated properly. So what are the symptoms of external hemorrhoid occlusion, the cause and how effective is the treatment?