Pathologic features of acute allergic colitis include congestion, edema and erosion of the intestinal mucosa, as well as exudation of inflammatory secretions, and in severe cases, multiple ulcers, which require active treatment. Acute allergic colitis due to the stimulation of inflammatory factors, there will be congestion and edema of the colonic mucosa, the mucosa will show diffuse fine particles, there will be exudation of inflammatory secretions, the increase in the brittleness of the mucosa will cause the mucosa easy to fall off and bleed, and there can be localized erosion or multiple ulcers. After the emergence of acute allergic colitis, you need to go to the hospital in a timely manner, under the guidance of the doctor in conjunction with the patient’s specific situation for treatment.