Stress is the body’s natural response to pressure, challenge, or uncertainty. When the brain detects stress, it releases hormones such as cortisol and adrenaline that prepare the body to react quickly.
Gastroenterologist Dr Jeffrey Nathanson of Comprehensive Gastrointestinal Health says this connection often shows up in patients who otherwise appear calm and high-functioning. “Often I’ll see a lot of very high-achieving individuals – successful in their personal and professional lives – who don’t register stress or anxiety in any other way except through their gastrointestinal symptoms,” he explains.
In the short term, this stress response can increase focus and alertness. But when stress occurs frequently or lasts for long periods, it can begin to influence how the digestive system functions.
Over time, repeated stress activation can:
• increase gut sensitivity
• disrupt normal digestive movement
• change pain signaling between the gut and brain
• alter hormone and immune activity
For people living with IBS and other gut-brain disorders, this ongoing stress response can make the digestive system more reactive and symptoms more likely to flare.
What research shows about stress and IBS
Research supports what many people with IBS already notice: stress can make symptoms worse. In a 16-month study following people with IBS, those experiencing higher levels of chronic life stress were much more likely to have ongoing or worsening symptoms.2
Other clinical studies show that people with IBS often have increased sensitivity in the digestive tract, known as visceral hypersensitivity.3 4 This means the nerves in the gut react more strongly to normal digestive activity, especially during stressful situations.
Other clinical studies show that people with IBS often experience greater sensitivity in the digestive tract during stressful situations. This heightened sensitivity is known as visceral hypersensitivity, meaning the nerves in the gut respond more strongly to normal digestive activity.
Because of this increased sensitivity, stress can directly influence how the digestive system processes sensations, making symptoms such as pain, cramping, or bloating feel more intense.
For many people living with IBS, these findings confirm something they already notice in daily life – stressful periods often coincide with worsening digestive symptoms.
How chronic stress changes the gut
When stress becomes ongoing, it can influence several important processes within the digestive system.
Research shows chronic stress can:
• increase muscle contractions in the intestines, causing cramps and urgency
• slow digestion, which may contribute to constipation
• alter the balance of gut bacteria in the microbiome
• increase inflammation in the digestive system
• amplify pain signaling between the gut and brain
These changes can make the digestive system more sensitive and reactive over time, which is why IBS symptoms often become more noticeable during prolonged stressful periods.
The role of trauma and emotional health in IBS
Emotional health and life experiences can also influence the gut-brain system.
Studies suggest that a significant number of people with IBS have experienced major life stressors or trauma. Events such as loss, long-term anxiety, emotional abuse, or other difficult experiences can keep the body’s stress response activated for longer periods.
Research also shows a strong connection between trauma and digestive disorders. GI Dr. Mark Salvatore notes that many people with gut-brain disorders have experienced significant life stress or trauma. Research supports this pattern – a systematic review found that about one in five people with gastrointestinal conditions experience post-traumatic stress disorder (PTSD).5
When the nervous system remains on high alert, digestive signals may feel stronger and symptoms may become more persistent.
Addressing emotional health does not mean symptoms are “in your head.” Instead, it reflects the close relationship between the nervous system and the digestive system.
Approaches that support emotional well-being and nervous system regulation can often play an important role in improving symptoms for people with gut-brain disorders.
Because IBS is closely connected to the gut-brain system, treatments that support both the nervous system and digestion can be especially helpful.
Research supports several approaches that reduce symptoms by calming the gut-brain connection.
These include:
• gut-directed hypnotherapy, which uses guided relaxation to regulate communication between the brain and digestive system
• cognitive behavioral therapy (CBT), which helps shift thought patterns that increase anxiety and symptom anticipation
• mindfulness and relaxation techniques that reduce nervous system activation
• gentle movement such as yoga or walking to support digestion and stress regulation
These approaches help the nervous system return to a more balanced state, which can reduce the intensity and frequency of IBS symptoms.
Alongside targeted therapies, everyday habits can help regulate the gut-brain system and reduce IBS flare-ups during stressful periods.
Helpful habits include:
• regular movement such as walking, stretching, or yoga to lower stress hormones and support gut motility
• consistent sleep routines that help regulate cortisol and nervous system balance
• regular meal timing to support stable digestion
• relaxation practices such as breathing exercises, meditation, or journaling that activate the body’s “rest and digest” state
• supportive social connection, which helps reduce stress and improve emotional resilience
Over time, supporting the nervous system through daily routines can help calm the gut-brain connection and make the digestive system less reactive to stress.
Frequently asked questions
What is the connection between stress and IBS?
Stress and IBS are connected through the gut-brain axis – the communication network between the brain and digestive system. When stress increases, it can change gut movement and sensitivity, triggering IBS symptoms.
Can anxiety cause stomach problems?
Yes, anxiety can affect digestion because the brain and gut communicate constantly. Stress signals can cause symptoms such as nausea, stomach pain, bloating, diarrhea, or constipation.
Why does stress upset my stomach?
Stress activates the body’s fight-or-flight response, which temporarily disrupts digestion. This can change how quickly food moves through the gut and make the digestive system more sensitive.
Approaches that regulate the nervous system can help, including gut-directed hypnotherapy, mindfulness, cognitive behavioral therapy, gentle movement, and stress management techniques.
Can managing stress improve IBS symptoms?
Yes. Many studies show that reducing stress and calming the gut-brain connection can help reduce IBS flare-ups and improve digestive comfort.
References
Monash University FODMAP Team. Anxiety, IBS and microbiome links. Monash FODMAP Blog. Published January 29, 2020. Accessed March 12, 2026. https://www.monashfodmap.com/blog/anxiety-ibs-and-microbiome-links/
Bennett EJ, Tennant CC, Piesse C, Badcock CA, Kellow JE. Level of chronic life stress predicts clinical outcome in irritable bowel syndrome. Gut. 1998;43(2):256–261.
Ford AC, Lacy BE, Talley NJ. Irritable bowel syndrome. N Engl J Med. 2017;376(26):2566–2578. doi:10.1056/NEJMra1607547.
Longstreth GF, Thompson WG, Chey WD, Houghton LA, Mearin F, Spiller RC. Functional bowel disorders. Gastroenterology. 2006;130(5):1480–1491.
Glynn H, Möller SP, Wilding H, Apputhurai P, Moore G, Knowles SR. Prevalence and impact of post-traumatic stress disorder in gastrointestinal conditions: a systematic review. Dig Dis Sci. 2021;66:4109–4119. doi:10.1007/s10620-020-06798-y
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