The time for bowel cancer to develop from early stage to late stage is related to the pathological type of tumor and the patient’s physique, etc. There is no clinical statistics on the time for bowel cancer to develop from early stage to late stage, and most of the patients will need about half a year to one year to develop to late stage without treatment. Tumors of different pathological types and patients with different physique will have different growth rates. In general, for early stage rectal cancer patients, if there is no treatment intervention, it takes about half a year to one year to develop to advanced stage bowel cancer. Therefore, early detection, diagnosis and treatment are important means to cure bowel cancer and prolong life. If patients with early-stage bowel cancer can be detected and diagnosed early, and under the guidance of doctors, most of the early-stage bowel cancer can be cured through radical surgical resection, and the 5-year survival rate of mid-stage bowel cancer patients can be more than 50% after active treatment. Once the bowel cancer develops into advanced stage, the time of surgery is missed and only radiotherapy can be carried out, most patients have poor prognosis and their expected survival is obviously affected. Most of the early bowel cancer patients are asymptomatic, but as the disease progresses, there may be changes in bowel habits, such as pus and blood stools, urgency, constipation, diarrhea, etc. It is recommended that patients seek early medical treatment, early diagnosis, early treatment, so as to improve the prognosis of the patients as much as possible, and to avoid the disease from progressing to the middle and late stages.