Sudden swelling of hemorrhoids is caused by local blood circulation disorders, and there are two common possibilities: i. Thrombosed external hemorrhoids, caused by blood clots forming in the external hemorrhoids or ruptured blood vessels and blood pooling under the skin. Second, inflammatory external hemorrhoids, due to connective tissue external hemorrhoids due to impaired circulation and lymphatic return, resulting in edema of connective tissue external hemorrhoids. The two acute attacks are accompanied by local pain and sudden enlargement of the nucleus of the hemorrhoid, which is caused by circulation disorders, so the treatment is also based on improving local circulation, taking oral Diosmin tablets or elimination tablets, and using topical Ma Yinglong hemorrhoid cream or hemorrhoid suppositories to control local symptoms. You should also pay attention to a light diet, avoiding spicy, irritating food stimulation, and use warm salt water or warm water sitz bath after the stool to reduce the local edema symptoms.