Early colorectal cancer may have no obvious symptoms, but the following symptoms may appear when the disease has developed to a certain extent: 1. Change in stool habit: right hemicolectomy is characterized by thin stool with pus and blood in the early stage, increased number of bowel movements, and alternating diarrhea and constipation when the cancer continues to increase and affects the passage of stool; while left hemicolectomy is characterized by difficulty in defecation, which will continue to worsen with the development of the disease. In addition, if the cancer is in a low position, it may also cause poor defecation and a feeling of urgency and heaviness. 2.Gastrointestinal tract symptoms: Abdominal distension, discomfort or indigestion-like symptoms. In the case of right hemi-colon cancer, it is mostly abdominal pain and discomfort or hidden pain. It can be intermittent at the beginning, and then turn into continuous, often located in the right lower abdomen.
In the case of left hemicolectomy, the obstruction can be sudden, with abdominal cramps, abdominal distension, hyperactive bowel movement, constipation and obstructed venting, or chronic obstruction symptoms such as abdominal distension, paroxysmal abdominal pain, hyperactive bowel sounds, and dyspepsia.
or chronic obstruction symptoms such as abdominal distension, paroxysmal abdominal pain, hyperactive bowel sounds, constipation, blood and mucus in stool. Symptoms of early colon cancer include anemia, low fever, weakness, emaciation, swelling, etc., especially anemia and emaciation. 4.Abdominal mass: About 50% of patients can find abdominal masses, which are cancer masses or masses infiltrated and bonded with omentum and surrounding tissues, hard and irregular in shape, and some masses can have a certain degree of activity with the intestinal canal, while advanced colon cancer masses can be fixed due to cancer infiltration. 5. Blood or mucus in stool: In right hemicolectomy, the amount of bleeding is small and fully mixed with stool due to peristaltic movement of the colon, which is not easy to see with the naked eye, but the occult blood test is often positive; while in left hemicolectomy, the bleeding and mucus are not mixed with stool, and about 1/4 patients can observe blood and mucus in stool with the naked eye. 6.Intestinal obstruction manifestation: incomplete or complete low-level intestinal obstruction symptoms, such as abdominal distension, abdominal pain (distension or colic), constipation or stool closure. Physical examination reveals abdominal rumbling, intestinal pattern, localized pressure pain, and hyper-intense bowel sounds can be heard.