Anal sinusitis will lead to pain in the area mainly in the anal sinus, in addition, when the condition is more serious, there will also be pain in the area around the anus, such as the buttocks and the posterior side of the femur and so on. 1. Anal sinus: after the anal sinus suffers from bacterial infection, usually there will be edema, congestion and other inflammatory manifestations, these stimuli through the nerve conduction so that the patient feels uncomfortable in the anal sinus area, in defecation, because the feces may press the anal saphenous fossa, resulting in anal sinus area pain. 2. Perianal area: If the condition is serious, the anal sphincter will contract due to fecal stimulation during defecation, which will make the pain more intense and may make the perianal area, such as the buttocks and posterior femoral side, feel obvious pain. When diagnosed with sinusitis, it should be treated as soon as possible under the guidance of a doctor, and should not be taken on its own to avoid delaying the condition.