Proctitis is examined by doctor’s examination such as rectal fingerprinting, laboratory tests such as fecal examination, and imaging tests such as barium contrast. 1. Rectal fingerprinting: Patients with proctitis may be able to touch the poor elasticity and roughness of the rectal mucosa, which can be used as a preliminary examination method for proctitis. 2. Laboratory tests: fecal examination: used to determine whether proctitis is caused by bacterial, viral, fungal and other infections. Routine blood test: to detect whether proctitis is caused by infection and to assess whether there is blood loss and the extent of blood loss. Others: C-reactive protein, food allergy screening test, related antibodies and toxin assay to rule out other infectious diseases. 3. Imaging tests: CT and MRI: If radiation proctitis is considered, these two tests can assess the degree of rectal radiation damage and the primary tumor. Barium contrast and MRI fecography: can help determine whether there is a combination of intestinal fistula and other complications. Proctitis can also undergo special tests such as proctoscopy or sigmoidoscopy, which can help to understand the extent of rectal lesions. Colonoscopy can rule out the presence of coexisting inflammation in the colon area and can be performed with a microscopic biopsy for a definitive diagnosis. Patients with proctitis are advised to consult a doctor for a clear diagnosis and targeted treatment under the guidance of a doctor.