Bowel cancer patients usually do not have abnormalities in routine blood tests. If the patients are combined with gastrointestinal bleeding, infection, intestinal obstruction, or undergoing chemotherapy or radiotherapy, hemoglobin, red blood cells, white blood cells, neutrophils and platelets will have abnormalities. Generally, when bowel cancer patients undergo routine blood test, the test result will not be abnormal. If bowel cancer patients have gastrointestinal bleeding such as blood in stool or vomiting blood, hemoglobin and red blood cells may be lowered during routine blood test. In addition, when bowel cancer is combined with infection or intestinal obstruction, white blood cells and neutrophils will be elevated in routine blood tests. When bowel cancer patients undergo chemotherapy or radiation irradiation treatment, the production of white blood cells, red blood cells and platelets in the body will be affected. When the patient undergoes routine blood test, the test result will show a decrease in white blood cells and platelets. It is suggested that if bowel cancer is detected, it is necessary to seek medical treatment in time. If the results of routine blood tests are abnormal, doctors will choose appropriate measures to treat the cause of the disease.