Stress and digestion: what does the latest research show?

Our hectic daily lives, constant pressure and chronic stress not only affect our mood and energy, but also our digestive system. More and more people are experiencing bloating, abdominal pain, irregular bowel movements or heartburn, often with no tangible organic cause. The latest scientific findings clearly confirm what many people have long suspected: stress and digestive problems go hand in hand. The complex relationship between the brain and the gut, the so-called „gut-brain axis”, plays a key role in this process.

Modern medicine is increasingly recognising that digestive diseases, especially functional disorders such as irritable bowel syndrome (IBS) or functional dyspepsia, cannot be separated from the psychological condition. For example, a 2019 US study showed that emotional stress can increase the risk of developing ulcer disease by up to 2.9 times.

In this article, we detail how stress affects our digestive system, the most common stress-induced digestive disorders, and the diagnostic and treatment options available in 2025. We'll look at the latest scientific evidence and give practical advice on how to alleviate your symptoms and when to see a specialist, such as Endomedix Gastroenterology Centre see your doctors.

How does stress affect the digestive system? The gut-brain axis

Our digestive system is often referred to as our „second brain”, and for good reason. The intestinal wall contains hundreds of millions of nerve cells that make up a complex network called the enteric nervous system (ENS). This system is in close, two-way communication with the central nervous system (the brain and spinal cord) via the gut-brain axis.

When we are under stress, the body's „hit or run” response is activated. This survival mechanism involves the release of hormones, such as cortisol and adrenaline, which prepare the body for danger. Its effects are also immediately felt in the digestive system:

• Changes in bowel movements: Stress can speed up or slow down the movement of the digestive system. Accelerated movement can cause diarrhoea, while slowed digestion can lead to constipation and bloating.
• Increased intestinal wall permeability: Chronic stress can damage the barrier protecting the intestinal wall, which can lead to „leaky gut syndrome”. In this case, bacteria and toxins can pass from the gut into the bloodstream, causing inflammation and other health problems.
• Visceral hypersensitivity: Stress can make the nerve endings in the gut more sensitive. This means that normal digestive processes, such as intestinal distension, can feel painful. This phenomenon is particularly common in patients with irritable bowel syndrome (IBS).
• Changes in stomach acid production: Stress can affect the production of stomach acid. In some people, it increases, which can cause heartburn and reflux, while in others it decreases, which impairs digestive efficiency.
• Imbalance of the gut flora: Gut bacteria, or the microbiome, play a key role in digestion and immune function. Stress negatively affects beneficial bacteria and can promote the proliferation of harmful microorganisms.

Frequent indigestion, which can be aggravated by stress

There are a number of digestive diseases whose symptoms can be significantly aggravated by stress, or even triggered by stress.

Irritable bowel syndrome (IBS)

IBS is the most common functional digestive disorder, affecting 10-20% of the population. Typical symptoms include abdominal pain, cramping, bloating and alternating diarrhoea and constipation. Research has shown that stress and anxiety directly exacerbate symptoms in IBS patients by increasing bowel movement disturbances and pain.

Functional dyspepsia

It is associated with pain in the upper part of the stomach, a feeling of fullness, early satiety and bloating, without any underlying organ lesions. Dyspeptic complaints affect nearly 20% of the population. Stress has been shown to contribute to the development of functional dyspepsia by affecting the movement and sensitivity of the stomach.

Inflammatory bowel diseases (IBD)

Crohn's disease and ulcerative colitis are chronic inflammatory diseases. Although stress alone does not cause these conditions, research clearly shows that stressful life events can provoke a flare-up of symptoms and exacerbate the course of the disease. Psychological stress can modify inflammatory processes in the gut.

Gastroesophageal reflux disease (GERD)

GERD develops when acidic stomach contents flow back into the oesophagus, causing heartburn and other unpleasant symptoms. Stress can worsen reflux symptoms in several ways: it can increase the production of stomach acid and loosen the lower esophageal sphincter muscles that prevent acid from flowing back into the esophagus.

Diagnostic options in 2025

When someone goes to the doctor with digestive complaints, the first and most important step is to rule out organic causes. The Endomedix Gastroenterology Centre specialists use the latest diagnostic techniques to make an accurate diagnosis.

Basic tests

• A detailed medical history and physical examination: The doctor will ask the patient about their symptoms, lifestyle, eating habits and stress levels.
• Laboratory tests: Blood, urine and stool tests help to rule out inflammatory processes, infections, anaemia or hidden bleeding. For example, measuring the calprotectin level in a stool test is a reliable indicator of the presence of intestinal inflammation.
• Hydrogen breath test: This painless procedure can be used to detect lactose or fructose intolerance and small intestinal contamination syndrome (SIBO), which can also cause bloating and diarrhoea.

Endoscopic examinations

If the symptoms (e.g. difficulty swallowing, weight loss, bleeding, age over 50) warrant it, endoscopic tests may be needed for an accurate diagnosis. Although many people are apprehensive about these procedures, it is important to know that they are now extremely safe and can even be performed under general anaesthesia.

• Gastroscopy (gastroscopy of the stomach): It is used to examine the oesophagus, stomach and duodenum. It can be used to diagnose reflux disease, ulcers, gastritis and histological samples (e.g. for celiac disease or Helicobacter pylori infection).
• Colonoscopy (colonoscopy of the colon): It can be used for an overview of the last part of the large and small intestine. It is essential for the diagnosis of inflammatory bowel diseases, polyps and tumours. Regular screening is the most effective way to prevent colorectal cancer.

Assessing the role of stress

Once organic causes have been ruled out and stress is suspected as the underlying cause, the diagnosis shifts to functional disorders. The doctor asks targeted questions to assess the patient's psychological state, anxiety and stress levels. In some cases, the involvement of a psychologist or psychiatrist may also be warranted for an accurate diagnosis and effective therapy.

Treatment strategies: harmony of body and soul

Treating digestive complaints caused by stress requires a complex approach that focuses not only on relieving symptoms but also on addressing the underlying cause, i.e. stress.

Lifestyle and nutrition

• Stress management techniques: Recent research has shown that mindfulness-based stress reduction (MBSR), yoga, meditation and relaxation techniques can significantly improve symptoms of IBS and other functional indigestion.
• Regular physical activity: Physical activity not only reduces stress, but also stimulates bowel movements and improves general well-being.
• Diet: Certain foods can make symptoms worse. For IBS, the FODMAP diet (avoidance of fermentable oligo-, di-, mono- and polysaccharides) can be effective. It is important to eat regular, rested meals, drink enough fluids and avoid bloating foods (e.g. pulses, cabbage).

Medication

A number of medicines are available to relieve symptoms:

• Antispasmodics: To relieve abdominal pain and cramps.
• Anti-bloating agents: To reduce discomfort caused by intestinal gas.
• Laxatives or belly clamps: To normalise bowel movements.
• Acid reducers (PPIs): For reflux and heartburn.
• Low-dose antidepressants: Certain antidepressants not only reduce anxiety and depression, but also act directly on the gut-brain axis, modifying pain sensation and bowel movements. These drugs are now widely used in the treatment of IBS.

Psychotherapy

Because stress and anxiety play a central role, psychotherapeutic methods can be highly effective.

• Cognitive behavioural therapy (CBT): It helps to identify and change negative thought patterns and behaviours that contribute to stress and exacerbate symptoms.
• Hypnotherapy: Several clinical studies have shown that gut-specific hypnotherapy is effective in reducing IBS symptoms in the long term.

When expert help is needed

The relationship between the digestive system and the psyche is extremely complex. Stress-related complaints are not „imaginary” illnesses, but real problems that often cause serious suffering. If you are experiencing persistent digestive problems, do not hesitate to seek professional help.

From Endomedix Gastroenterology Centre doctors not only use the most up-to-date diagnostic procedures to rule out organic causes, but also take a holistic approach, taking into account the unity of body and mind to help you find the real cause of your complaints and the most effective, personalised treatment strategy. Don't suffer in silence, get help to regain harmony in your digestive system and your daily life!