I am 65 and for the past week, my bowel movements are significantly different than they ve been my adult life. Normal for me are bowel movements that don t smell, there s nothing to wipe and I have no gas. For the past week, I ve had multiple bowel movements one after the other, there s wiping required, and considerable gas on and off throughout the day, causing discomfort until I can pass the gas. What may be causing this?