Causes of wasting caused by bowel cancer include consuming the disease itself, making the digestive function impaired, distant metastasis and so on. 1. Bowel cancer is a kind of malignant tumor of intestines, malignant tumor cells have high metabolism, which will consume more nutrients of the body, and in the long run, it will cause wasting. 2. Bowel cancer will impair the digestive function, the ability of intestinal tract to absorb food will become poor, the nutritional intake will be worse than the health condition, the high metabolism of cancer cells will aggravate the wasting. 3. When bowel cancer develops to the late stage, distant metastasis will occur, which may be transferred to the stomach, esophagus, etc., affecting food intake, and nutrition cannot be supplied, which will also lead to wasting. When bowel cancer occurs, it is suggested that patients should actively seek medical consultation and follow the doctor’s instructions for reasonable and standardized treatment, so as to improve the quality of patients’ survival.