The incidence of bowel cancer is decreasing worldwide, but in China the incidence is increasing and the trend is younger. The peak age of incidence is 50-70 years old, and the ratio of men to women is about 2:1. However, in recent years, we have seen more and more bowel cancer patients under 30 years old in clinic, and the youngest bowel cancer patient I have ever seen is a 12-year-old girl with liver metastasis at the time of initial diagnosis, and the prognosis is very poor. Early manifestations Colon cancer has different clinical manifestations depending on the site of occurrence. Most of them are bright red, so it is easy to mistake them for hemorrhoids and miss the diagnosis. Very often, colon cancer may also combine with hemorrhoids, so don’t think that blood in stool is not a big problem because of hemorrhoids. 2.Change of stool habit and trait. If the stool becomes thin, there are indentations on the surface, alternating diarrhea and constipation. 3, abdominal symptoms. Such as abdominal distension and abdominal pain, abdominal masses are felt. 4.Symptoms of obstruction. Because the mass is too large to cause pressure obstruction symptoms, can be manifested as progressive aggravation of abdominal pain, nausea and vomiting 5, other. Such as abdominal pain and fever caused by intestinal perforation, as well as the wasting symptoms of the tumor itself, such as weight loss and fatigue. The above manifestations are not specific, so it does not mean that the above manifestations must be intestinal cancer, but if you have the above manifestations, you should be cautious about the possibility of intestinal cancer and have the relevant examination as soon as possible. Many people are afraid of having colonoscopy because they think it is painful and they think it is troublesome to take laxatives. In fact, many hospitals can carry out painless colonoscopy, and you can wake up and finish the examination without pain (of course, not everyone is suitable for painless colonoscopy, and anesthesiologists will evaluate it). 1. Rectal finger examination. For low-level intestinal cancer (masses within 7cm from the anus), doctors can detect it through rectal finger examination, and rectal finger examination is a non-invasive test, which is highly popular. 2.Colonoscopy. Electronic colonoscopy can detect the presence or absence of masses, their location, size and nature, and biopsy for pathology. 3.CT examination. About 50-60% of intestinal cancer may be combined with liver and lung metastasis, and the site, size and number of metastasis directly affect the treatment strategy, so the first-time diagnosed intestinal cancer patients should have plain scan + enhanced CT examination of chest/abdomen/pelvis. 4.Tumor markers. About 20% of bowel cancer patients will have elevated tumor markers, and the more sensitive ones are CEA and CA199, which can be used as indicators for future follow-up and help predict the efficacy and the presence of recurrence and metastasis.