After gastric cancer resection, especially smelly stool in chemotherapy period may be a normal phenomenon or due to indigestion. 1. Normal phenomenon: after gastric cancer resection, black stool and bloody stool may appear in short term, mainly due to bleeding from gastrointestinal anastomosis or small intestinal anastomosis, the blood can not be absorbed in intestines, which will lead to black stool, and if the bleeding amount is more, the blood may be discharged, and if the color is yellow and stinky, it is normal, and there are indoles and other substances in the stool, which will lead to stinky stool. 2. Indigestion: especially smelly stool during chemotherapy after gastric cancer resection may be due to dysfunction of bacteria in digestive tract, decreased peristaltic ability of gastrointestinal, indigestion of food and excessive corruption of colon, resulting in especially smelly stool. If there is particularly smelly stool during chemotherapy after gastric cancer resection, it is recommended to closely observe the abnormal situation, consult doctor in time and follow doctor’s instruction to intervene and deal with it.