Firstly, if rectal bleeding occurs before a doctor's diagnosis, it is imperative to seek medical attention promptly to rule out other conditions. The cause of the bleeding could be from a site above the anus or other diseases related to the anus, and it might not necessarily be an anal fissure. If diagnosed with an anal fissure, treatment generally involves the local application of ointment. It is important to avoid conditions in daily life that could lead to constipation or diarrhea, as these can irritate the mucous membrane of the anus and exacerbate the symptoms of an anal fissure. Dietarily, it is beneficial to eat more vegetables, fruits, and foods high in rough fiber to ensure that stools are well-formed. If anal fissures recur, do not avoid seeking medical help, as this could lead to the formation of scars and contractions around the anus, causing anal stenosis, at which point surgery would be necessary.