Rectal cancer T1 indicates that the scope of local tumor invasion is smaller and metastasis is less likely to occur. Rectal cancer T1 stage means that the tumor infiltrates into the mucosal layer and submucosal layer, at this time, the local tumor is more confined and metastasis is less likely to occur. However, as a systemic disease, even if the tumor is smaller and more limited, there is the possibility of metastasis. Early stage of rectal cancer usually has no obvious symptoms, with the development of the disease, patients may have frequent bowel movement, change of bowel habit, feeling of anus dropping before defecation, incomplete defecation, etc. If patients have these symptoms, they may have the possibility of having metastasis. If patients have these symptoms, they may have rectal cancer. If there is no lymph node metastasis and distant organ metastasis, T1 rectal cancer belongs to stage I. If the tumor is accompanied by regional metastasis, it may be in stage II. If T1 tumor is accompanied by regional lymph node metastasis, it may be stage II or III, and if it is accompanied by distant organ metastasis, it is stage IV. Patients with rectal cancer T1 need to go to regular hospitals to improve the examination, clarify the stage, and treat under the guidance of doctors.