Nervous stomach? You're not alone. Pain in the stomach and abdominal area is a common symptom for a range of issues, and anxiety and stress may be responsible for this pain if no other biological cause (e.g., stomach ulcers) can be found.

People with anxiety disorders develop gut symptoms such as cramping, bloating, and abdominal pain more frequently than healthy individuals. And, people with gut symptoms are much more likely to suffer mental health problems.

This two-way link between anxiety and abdominal pain is shown in ‘functional gastrointestinal disorders’. The most common functional disorder is irritable bowel syndrome (IBS), affecting 1 in 7 people worldwide. (1)

Functional Gastrointestinal Disorders

Functional gastrointestinal disorders such as irritable bowel syndrome (IBS) differ from conditions such as inflammatory bowel disease (IBD) or coeliac disease that have a physical basis. In these ‘functional’ disorders, the digestive tract is healthy, yet symptoms are still experienced.

Multiple factors – environmental, psychological, and social – contribute to the development of functional gastrointestinal disorders. Stress, in particular, may be an initial trigger for symptoms. However, gut bacteria imbalances and psychological conditions such as depression may also contribute. ­(2, 3)

Irritable bowel syndrome

Irritable bowel syndrome (IBS) is the most common functional gastrointestinal disorder. It is defined by persistent abdominal pain and one or more additional symptoms, such as a change in stool frequency.

The most common symptoms of IBS are:

  • Abdominal pain
  • Bloating
  • Cramping
  • Gas
  • Constipation or diarrhea (4)

IBS and mental health

IBS is more common in individuals who suffer mental health issues. It has been shown that over 50% of people with IBS also experience mental health conditions, such as:

Although the cause of IBS is not known, the enteric nervous system and gut-brain connection are thought to be involved. These help to explain how psychological ill-health may be linked with gastrointestinal symptoms.

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The enteric nervous system

The enteric nervous system refers to the neurons controlling the digestive system. This ‘second brain’ is connected to the central nervous system – the brain and spinal cord. This system relies on neurotransmitters to communicate with the central nervous system and may affect mood. (6)

After sensing food, the nerves of the enteric nervous system communicate with muscle cells to initiate contraction, moving food along the intestines.

In response to stress and in disorders such as IBS, the enteric nervous system may function abnormally. For instance, levels of neurotransmitters such as serotonin may be altered, or nerves may become hypersensitive. This may lead to gut symptoms such as abdominal pain, cramping, or constipation.

The gut-brain axis

The ‘gut-brain axis’ refers to the two-way communication between the brain and gut. It helps explain how stress can contribute to gastrointestinal symptoms, and is made up of several components:

  • The enteric nervous system
  • The Vagus nerve
  • Levels of gut bacteria in the intestines
  • Neurotransmitters, such as serotonin (6,7)

The gut-brain axis is being investigated in the new field of ‘neurogasterenterology’. Modern research has allowed researchers to measure pain perception in the gut, and the effect of gut bacteria on mental wellbeing. Stress and mental illness are being uncovered as a source of GI dysfunction. (7)

Stress causes IBS?

‘Stress’ is the term for the normal response to survival, and chronic levels of stress may disrupt the gut-brain axis. This may lead to gastrointestinal symptoms, including abdominal pain.

GI symptoms may arise due to the following effects of the stress response:

  • Activation of the ‘fight-or-flight’ response
  • Increased sensitivity to visceral (bodily) pain
  • Reduced gut motility – the speed of transit through the GI tract (8,9)

These mechanisms slow the passage of food through the intestines, leading to pain and other symptoms of IBS. Researchers have confirmed that stressful experiences, tested with complex pattern recognition tasks, make IBS patients more sensitive to non-painful stimuli. (10)

However, the exact mechanism for how stress causes IBS is not known. One theory suggests that people who are predisposed to IBS – by genetics or early life trauma – develop the condition after a long period of stress, which acts as the trigger. (11)

IBS causes stress?

It works the other way, too: IBS symptoms may cause stress. Normal GI activities, such as needing to go to the bathroom, may be misinterpreted by the brain of a person with IBS as a catastrophic event, triggering the ‘fight or flight’ response.

Or, they may suffer anxiety about the social situations in which symptoms occur. This misinterpretation of normal digestive processes as dangerous leads to stress.

Hence, a vicious cycle may emerge between IBS symptoms such as abdominal pain and stress. (12)

The biopsychosocial model

More broadly, the ‘biopsychosocial model’ (1980) explains how stress and anxiety may link to abdominal pain. As suggested by the name, the model proposes that biological, psychological, and social factors may all contribute to disease. Looking at IBS this way helps to explain how stress – a social and psychological factor – may have a biological effect on the gut. It also explains how therapies targeting the mind, such as hypnotherapy and CBT, make sense as treatments for gut symptoms.(13)

Confirming the model, scientists in China recently found a link between stress and IBS. They showed that a protein called NGF appeared in higher rates following early life trauma, and led to symptoms of IBS. Hence, the biopsychosocial model appears valid in IBS. (14)

How to calm a nervous stomach

Given the importance of the psychological process in IBS, it is unsurprising that psychological therapies are an effective treatment option. Several psychotherapies are effective in reducing gastrointestinal distress:

  • Gut-directed hypnosis (GDH). This hypnosis involves the patient visualizing their gut as a set of slimy tubes and other gut-related imagery. This helps to restore the gut-brain communication to reduce symptoms of IBS. Smartphone-based versions such as Nerva have recently become available, and offer convenient access to hypnotherapy. (15)
  • Cognitive-behavioral  therapy (CBT). This skill-based therapy teaches control over negative thought patterns and modifies patterns of behavior. Relaxation techniques help to control the stress response, and cognitive     restructuring allows the patient to avoid catastrophizing. These techniques help to reduce the symptoms of IBS. (16)
  • Mindfulness-based therapies. This practice involves attending to the present moment and cultivating non-judgemental attitudes. Mindfulness therapies reduce levels of stress and sensitivity to pain, a key symptom of IBS. The effects have been shown to last over three months (17), although these therapies can be less effective than GDH and CBT.

These treatment options are likely to target both symptoms of anxiety, and functional symptoms such as abdominal pain. Psychological therapies, especially gut-directed hypnotherapy, have been shown as effective, if not more effective, than diets and medications for relieving IBS symptoms.

Other treatments for IBS            

The following treatments are also available for IBS. However, the effectiveness can be lower than for psychotherapies:

  • Low FODMAP diet. This diet eliminates common ‘trigger compounds’ of IBS such as fructose and lactose and has been shown effective in treating IBS. (18)
  • Antidepressant medication. Low dose treatments of selective serotonin reuptake inhibitors (SSRIs) and tricycle antidepressants (TCAs) have been shown to relieve symptoms of IBS. (19, 20)
  • Peppermint oil. It's been shown that peppermint oil is a natural anti-spasmodic which means it can relax the smooth muscles in the gut, improving some of the symptoms of IBS.

When should I see the doctor?

If gastrointestinal symptoms and pain persist for more than a few days, you should consult a doctor. You may be instructed to undertake certain tests or see a specialist if there are signs of a more life threatening medical condition. If you experience abdominal pain and the following symptoms, you should consult a doctor as soon as possible:

  • Vomiting blood
  • The abdomen is larger than usual and hard
  • Rectal bleeding
  • You stop having bowel movements

These symptoms may suggest the pain is linked with a biological disease and is not a symptom of IBS or another functional gastrointestinal disorder.

Alternative causes of abdominal pain

As well as from functional gastrointestinal disorders, there are many other sources of abdominal pain. This pain may arise from inflammation, distension, and stretching or impaired blood supply. These include:

  • Heartburn (indigestion after eating)
  • Gallbladder inflammation
  • Ulcerative colitis
  • Crohn’s disease
  • Kidney stones
  • Gluten intolerance (coeliac disease)
  • Menstrual cramps
  • Gastroenteritis (inflammation)
  • Irritable bowel syndrome
  • Ischemic colitis
  • Vasculitis
  • Pregnancy (21)

Diagnosis of abdominal pain

If you experience abdominal pain and other GI symptoms, your physician will likely ask you a series of questions, addressing the pattern and persistence of the pain. A range of diagnostic tests may also be used to assess for certain medical conditions, including:

  • Physical examination
  • Ultrasound
  • Colonoscopy
  • Endoscopy
  • Magnetic resonance imaging (MRI)
  • Computerized tomography (CT) (22)

Treatments for abdominal pain

A range of treatment options are available for abdominal pain of biological origin, depending on the cause. These include:

  • Antibiotics for gastroenteritis
  • Antacid for gastroesophageal reflux disease (GERD).
  • Surgery, for bowel obstruction
  • Corticosteroids for ulcerative colitis or Crohn’s disease
  • Loperamide for diarrhea-induced cramping
  • Painkillers (e.g., paracetamol) (23, 24)
  • Pain Hypnosis

Preventing abdominal pain

Some forms of abdominal pain require medication or surgery. However, certain behaviors may minimize the risk of many types of abdominal pain:

  • Exercising correctly and making fitness-based lifestyle changes
  • Eating a healthy diet, rich in vitamins and minerals
  • Staying hydrated
  • Taking herbal remedies such as ginger and peppermint
  • Limiting alcohol consumption

A Word from Mindset Health

If you suffer anxiety and abdominal pain, and diagnostic testing finds no physical cause, you may have IBS. The gut-brain connection suggests how physical symptoms of IBS such as stomach aches may be linked to anxiety symptoms and stress levels. Seeking help from a mental health professional and receiving psychotherapies such as gut-directed hypnosis will offer the chance for your gut and mind to be healed as one.

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Contents

Calm IBS in 6 weeks

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Could it be IBS?
Take the quiz to find out.
Free guide to managing IBS with hypnotherapy
Calm IBS in 6 weeks
Diet and drug free program
50,000+ people helped
Created by Dr Simone Peters
What if you could calm IBS in just 6 weeks?
Diet and drug free program
50,000+ people helped
Created by Dr Simone Peters from Monash Univeristy
Could it be IBS?
Take the quiz to find out.
Calm IBS in 6 weeks
Diet and drug free program
50,000+ people helped
Created by Dr Simone Peters
Calm IBS in 6 weeks
Diet and drug free program
50,000+ people helped
Created by Dr Simone Peters
Calm IBS in 6 weeks
Diet and drug free program
50,000+ people helped
Created by Dr Simone Peters
Calm IBS in 6 weeks
Diet and drug free program
50,000+ people helped
Created by Dr Simone Peters
Manage IBS with gut-directed hypnotherapy
Start free trial
Sleep better, without hormones
App based
Low risk
Evidence based
Manage hot flashes in just five weeks
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Manage hot flashes without hormones
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Refer, monitor and grow
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Try a new way to manage your pain
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