Gut-brain axis explains physical digestive reactions to stress

The connection between emotional tension and physical abdominal discomfort is explained by the gut-brain axis, a bidirectional communication system between the brain and the digestive tract. This interaction occurs through various neural and hormonal pathways, including the vagus nerve, allowing the brain to influence digestion and the gut to send signals to the nervous system.

According to the World Health Organization, over one billion people live with mental health disorders, such as anxiety and depression, as of 2025. Stress can manifest physically through gastric discomfort, changes in appetite, nausea, and altered intestinal transit. Research, including reports from the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), highlights how these biological mechanisms allow stress to modify digestive functions and the perception of pain.