A doctor on TikTok explained that the urge to use the restroom right after eating is common and caused by the **gastrocolic reflex**. “When you eat and you feel like you have to use the restroom right after, this is something called the gastrocolic reflex,” he said.

According to *VeryWell Health*, this reflex happens when your stomach stretches after eating, triggering signals that tell your colon to contract and make room for new food. Dr. Salhab added, “What’s coming out isn’t the food you just ate but old digested food and water.”

For people with **irritable bowel syndrome (IBS)**, this reflex can be stronger. *Cleveland Clinic* states that IBS may cause bloating, gas, diarrhea, and stomach pain. “Some people experience severe cramping or diarrhea because of the powerful contractions in their colon,” Dr. Salhab noted.

To ease symptoms, Dr. Salhab suggests avoiding triggers like **carbonated drinks, alcohol, citrus, dairy, and fried or fatty foods**.

The gastrocolic reflex is a normal response, but in some people—especially those with IBS—it can lead to more intense discomfort after meals.