What are colon cancer symptoms

 

Colon cancer is a common malignant tumor of the digestive tract that occurs in the colon. It occurs at the junction of the rectum and the sigmoid colon. The incidence rate is highest in the 40 to 50-year-old group, and the ratio between males and females is 2 to 3:1. The incidence accounted for the third place in the gastrointestinal cancer. 

 

Colon cancer is mainly adenocarcinoma, mucinous adenocarcinoma, and undifferentiated carcinoma. The general shape is polypoid, ulcerous and so on. Colon cancer can develop along the intestinal wall, and it spreads along the longitudinal diameter of the intestine or infiltrates deep into the intestine. In addition to lymphatic vessels, blood flow, and local invasion, it can also be transplanted into the abdominal cavity or spread along the sutures and incisions. . Patients with chronic colitis, colon polyps, and male obesity are susceptible.

 

In the early stage, there may be no symptoms. In the middle and late stages, abdominal distension and indigestion may occur, followed by changes in bowel habits, abdominal pain, mucous or sticky blood. After tumor ulceration, blood loss, and toxin absorption, symptoms such as anemia, low fever, fatigue, weight loss, and lower limb edema are often present. 

 

If abdominal distention, abdominal pain, constipation or inability to defecate, the physical examination shows abdominal distension, intestinal type, local tenderness, auscultation and bowel sounds, suggesting that incomplete or complete intestinal obstruction may occur. If the tumor and the omentum, surrounding tissue infiltration and adhesion, the formation of irregular mass. Late jaundice, ascites, edema and other signs of liver and lung metastases, cachexia, supraclavicular lymph node enlargement and other tumors distant metastasis transfer performance. Different parts of colon cancer, different clinical manifestations, are described as follows:

1. Right colon cancer

The right colon has a large cavity and the feces is in liquid form. The cancer is mostly ulcerous or cauliflowerous, and it rarely forms a ring-shaped stenosis. Infrequent obstruction occurs. If the cancer bleeds and bleeds, secondary infection, accompanied by toxin absorption, may have abdominal pain, changes in stool, abdomen, anemia, emaciation, or dyscrasia.

Left colon cancer

The colon of the left colon is fine and the stool is hard. Left colon cancer is often infiltrative, and it can easily cause ring stenosis. The main manifestations are acute and chronic intestinal obstruction. The mass of the mass is small, neither bleeding nor toxins are absorbed. It is rare for symptoms such as anemia, emaciation, and dyscrasia, as well as difficulty in massaging and massaging. Colon cancer often has organ metastasis, and distant metastasis is mainly liver. 

 

Lymphatic metastases generally spread from near to far, but there are also metastases that do not follow the order. Cancer is more likely to invade lymphatic metastasis in the muscular wall of the intestinal wall. Colon cancer cells or cancer emboli can also metastasize through the blood, first to the liver, and later to the lungs, brain, bone and other tissues. Colon cancer can also directly infiltrate the surrounding tissues and organs, fall off in the intestine, and can be grown on the mucosa elsewhere. Spread to the entire abdomen, can cause cancerous peritonitis, abdominal effusion and so on.