Bleeding anal fissures caused by too hard a stool may heal on their own in some patients with lifestyle adjustments, but if they bleed repeatedly, they need medical attention. Anal fissures are ischemic ulcers and have a certain self-healing mechanism. For superficial and small anal fissures, after occasional constipation and bleeding, patients can relieve the symptoms of anal fissures and promote fissure healing by eating a light diet, not eating spicy and irritating foods, and paying attention to personal hygiene. However, some patients may have developed old anal fissures if the fissure bleeds repeatedly and has little effect after medication. Old fissures usually do not heal on their own and need to be considered for surgery. Therefore, when bleeding anal fissures due to too hard stools occur, attention should be paid to adjusting diet and living habits. If symptoms do not ease for a long time, colonoscopy and timely treatment are needed to prevent the development of old anal fissures, which may affect the quality of life.