A long trip in a car, train or plane can disrupt your colon’s normal timing of contractions that lead to bowel movements. This can result in constipation, especially if your normal diet is altered by food served at the destination. The stress of traveling can also trigger constipation. If you notice symptoms of constipation on vacation — such as pain or tightness in your lower abdomen, blood in the stool or a hard, dry stool — talk to your doctor. He or she may recommend that you drink extra fluids, and try to schedule bathroom breaks that match your regular routine. Drink at least half your body weight in ounces of fluid daily. This can be difficult if you’re on a long trip, but you can bring a water bottle and look for refill stations at airports and train stations.