The pain starts three months after the perianal abscess surgery, which may be due to the recurrence of perianal abscess, infection or the presence of anal fissure. 1. Recurrence of perianal abscess: some patients may experience recurrence of perianal abscess within one year after surgery, at this time, patients may feel pain, swelling or fever and other symptoms in the anus. 2. Infection: as perianal abscess surgery will lead to trauma in the anus, if the postoperative care is not proper or the patient’s living habits are poor, it may lead to poor healing of the trauma. If the unhealed wound becomes infected during defecation, the patient may experience pain. 3. Anal fissure: If the patient’s stool is too dry and the defecation is too hard, it may lead to anal fissure. Patients may also feel pain when anal fissure occurs. It is recommended that patients should consult a doctor in time for the above mentioned situations, and under the guidance of professional doctors, make a clear diagnosis and give targeted treatment to avoid delaying the condition.