What is functional dyspepsia and how is it different from IBS?

Functional dyspepsia is characterised by chronic discomfort centred in the upper abdomen — including post-meal fullness, early satiety, epigastric pain, and burning — without a structural cause identifiable on investigation. IBS primarily involves the lower gut (cramping, altered bowel habits, bloating). Both are functional gut disorders sharing the characteristic of normal investigation results alongside significant symptoms, and both involve gut-brain axis dysregulation.

What dietary approaches help functional dyspepsia?

Small, frequent meals rather than large ones; eating slowly and chewing thoroughly; avoiding high-fat foods, spicy foods, and caffeine which delay gastric emptying; not lying down within two to three hours of eating; and reducing alcohol are the most consistently helpful dietary strategies. Some people find that identifying and avoiding personal trigger foods through a food diary is useful. There is no universal dietary approach that works for everyone with functional dyspepsia.

Can Helicobacter pylori cause functional dyspepsia?

H. pylori infection can cause or worsen dyspeptic symptoms, and eradication of H. pylori in infected individuals with dyspepsia produces lasting symptom improvement in a proportion of patients — typically around 10–15% more than placebo. Testing for H. pylori (breath test, stool antigen test, or biopsy) is recommended in dyspepsia assessment. However, most people with functional dyspepsia do not have H. pylori, and many with H. pylori have no symptoms at all.

How does stress affect functional dyspepsia?

The gut-brain connection is central to functional dyspepsia. Psychological stress slows gastric emptying, increases gastric acid secretion, and amplifies visceral sensitivity — making normal digestive sensations feel more uncomfortable. Anxiety and depression are common comorbidities. Mindfulness-based stress reduction, gut-directed hypnotherapy, and cognitive-behavioural therapy all have evidence for improving functional dyspepsia symptoms by modulating the brain-gut axis.

Digestivelow Risk

Functional dyspepsia

Chronic or recurrent pain or discomfort centered in the upper abdomen.

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Reviewed by Dr. Ciara Magee · Integrative Midwifery26 March 2026Emerging evidence

Quick answer

Functional dyspepsia involves persistent upper abdominal discomfort, bloating, or early fullness without an identifiable structural cause. Dietary changes, gut-brain therapies such as hypnotherapy, acupuncture, and stress management show good evidence for symptom relief.

Do any of these feel familiar?

Functional dyspepsia typically presents as a lingering discomfort, fullness, or burning sensation in the upper abdomen — often starting shortly after eating or persisting throughout the day
Many people describe feeling uncomfortably full long before finishing a meal, even after eating small amounts
Bloating, belching, and nausea are common companions
Because investigations often return normal results, many people are left feeling unheard or dismissed
The unpredictable nature of symptoms — better some days, significantly worse on others — adds to its impact on quality of life and can create anxiety around eating

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Related Conditions

IBS

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