 [ Symptoms ] can a virus cause my stool to be green my stool has been soft green in color the last 3 days should this be a cause for alarm is it caused by a virus or my taking of low dose aspirin [ Disease ] nope viruses like the stomach flu that comes from food poisoning or close contact can only cause main symptoms like nausea andor vomiting diarrhea and other stomach cramps if you are still unsure of why you have green stool then it is a good idea to see a doctor and tell him or her that you have green stool