A single colon polyp 0.4mm usually does not need to be removed when there are no other uncomfortable symptoms, but it usually needs to be removed if the patient develops other uncomfortable symptoms. The presence of a single colon polyp 0.4mm in a patient may be due to a variety of factors such as poor diet, age, and recurrent infections. Generally the polyp will grow, if the patient does not have other uncomfortable symptoms, usually do not need to remove, go to the hospital for regular review can be. If patients with solitary colon polyps experience pain and other uncomfortable symptoms, it is recommended to go to the hospital for timely examination, and under the guidance of the doctor to take the surgical method for removal, after the operation of the cut tissue for pathological examination, such as malignant lesions, but also need to be further chemotherapy (eg, 5-FU, furacil, etc.), and regular review. Patients presenting with a single colonic polyp of 0.4 mm need regular review, regardless of whether it is removed or not.