Stopping drinking alcohol can lead to changes in bowel movements, including constipation or diarrhea. Alcohol affects the digestive system, and when you stop drinking, your body has to adjust to the absence of alcohol. This adjustment can cause changes in bowel movements, including constipation. Additionally, if you have been drinking heavily, your body may be dehydrated, which can also contribute to constipation. If you are experiencing constipation after quitting drinking, it is important to drink plenty of water and eat a balanced diet with plenty of fiber to help promote regular bowel movements.