Constipation occurs when your frequency of bowel movements becomes less than what you're used to. Not having a bowel movement for three or more days is considered constipation. In most cases, constipation while traveling will go away on its own within a couple of days or when you settle in or return home.

Vacation constipation, often referred to as "travel belly," typically lasts between two to five days, though the duration depends heavily on how quickly your body adapts to its new environment. It is primarily caused by a disruption in your circadian rhythm and routine; your gut has its own "internal clock," and changing time zones or altering your morning schedule can confuse the digestive system. Additionally, the low humidity of airplane cabins leads to dehydration, which hardens stool, while vacation diets often lack the fiber your body is accustomed to. For most travelers, the issue resolves naturally once they "settle in" to their destination and re-establish a regular eating and sleeping pattern. However, if you continue to ignore the urge to go due to "bathroom anxiety" in unfamiliar places, it can persist for the entire duration of your trip. To shorten the duration, medical experts recommend aggressively hydrating with water, maintaining some form of physical activity like walking, and incorporating fiber-rich local fruits or a mild magnesium supplement to help "restart" the digestive process.