When rectal cancer spreads out of the intestinal wall and infiltrates more extensively in the pelvis (or when it recurs in the pelvis after surgery), it can cause soreness and swelling in the lumbar and sacral areas. Invasive cervical cancer is often detected during gynecological examination and confirmed by pathological biopsy histological examination. Some cervical cancers are asymptomatic and seen abnormally by the naked eye, so pay attention to the differentiation. Symptoms of pelvic infiltration caused by rectal cancer: 1. Feeling of perineal swelling: When rectal cancer in the jugular abdomen is large or invades surrounding tissues, there is often a feeling of perineal swelling, anal drop, and a feeling of incomplete defecation. Therefore, the patient feels full and distended in the anus, and the discharge can flow from the anus, mixed with pus and blood. The tumor in rectum can also make the patient have the feeling of foreign body in rectum and anal discomfort after defecation. 2.Abdominal pain: Only a few rectal cancer patients have this symptom in the early stage, according to the statistics of three hospitals in Shanghai, 11.35% of rectal cancer patients have abdominal pain as the first symptom. Upper rectum and rectosigmoid cancer sometimes form circular stenosis and gradually obstruct the intestinal cavity, and also appear paroxysmal abdominal cramps, and there are abdominal distension, hyperactive bowel sounds, thinning of stool and reduction of anal venting, and these symptoms will be relieved or disappear to some extent after defecation. 3.Change in defecation habit: Change in defecation habit is also a common early symptom of rectal cancer. Before rectal cancer, patients had regular bowel movement, but after the disease, bowel movement lost its regularity, such as changes in the number of bowel movements, time and quantity, etc., but there are differences depending on the location of cancer and the pathological type of tumor. Papillary carcinoma of the rectum has excessive mucus secretion, which can lead to diarrhea and frequent stools in the early stage. This is the result of intestinal dysfunction caused by the stimulation of intestinal tract by the lesion, which can be manifested as constipation aggravation, and more often as diarrhea, which is mostly in the early morning. This performance can be repeated four to five times in the morning until a more satisfactory bowel movement can be completed. It is called dawn diarrhea because the bowel movements are mostly in the morning. However, in some cases, this diarrhea can last all day, especially after meals, and even at night, so that their sleep is disturbed. In fact, only a small amount of blood and mucus is excreted each time, so it should be emphasized that this is a kind of pseudo-diarrhea, but in fact it is constipation, so patients often need to take laxatives. Circumferential hard carcinoma often shows signs of constipation earlier, and later patients often take laxatives, but the stool becomes thinner and even forms diarrhea. 4.Blood in stool: Blood in stool is the most typical symptom of rectal cancer, about half of rectal cancer patients have this symptom at the beginning. When the cancer is limited to the mucosa, there is no bleeding and only some mild discomfort, such as anal distension or itching. When the cancer invades the submucosa, there will be bleeding, but the amount of bleeding is generally very small, bright red or dark red, mostly on the surface of feces, and the bleeding is intermittent, so most of them do not pay attention to it, and often mistake it for internal hemorrhoids or anal fissure, and do not come to the clinic. According to Zhang Qingrong 374 cases of rectal cancer statistics, 80% have a history of blood in the stool, of which 60% are the earliest symptoms. According to the statistics of three hospitals in China, 51.92% of the early signs of rectal cancer are blood in the stool, and if this symptom occurs continuously and lasts for more than a month, it must be closely observed and various examinations must be conducted continuously until the cause of blood in the stool is satisfactorily explained. 5, mucus blood stool: huge cauliflower-shaped tumor mass and inflammatory lesions of the intestinal mucosa often secrete a lot of mucus, so it can cause mucus stool, if mixed with gas, the stool is foamy. Combined infection around the lesion can produce large amount of pus, which can be easily misdiagnosed as chronic enteritis or dysentery. When the surface of the cancer is eroded and ulcers are formed, in addition to the bleeding phenomenon, the stool is often thinner and contains more mucus and pus and blood, which is purulent and smells very bad.