saudigastro.com/patients/centrally-mediated-abdominal-pain
Category
Chronic
Red flags
5
This article is educational and does not replace your doctor's advice. Seek urgent care for any red-flag symptoms.
What is it?
Centrally mediated abdominal pain syndrome (formerly called functional abdominal pain syndrome) is a long-lasting belly pain that is not explained by bowel movements, eating or periods, and not by disease that tests can find. In this condition, the brain and spinal cord turn up the volume on pain signals from the gut, a process called central sensitisation. The pain is real, and can be severe. It belongs to the group of disorders of gut-brain interaction, which also includes irritable bowel syndrome and functional dyspepsia.
How common is it?
It is less common than irritable bowel syndrome but is an important cause of long-term belly pain and repeated medical visits. It is reported more often in adults, and it frequently occurs in people who have had previous stress, trauma, abdominal surgery or other long-lasting pain conditions.
Why does it happen?
The cause is not a single event. After an infection, an operation, an injury or a period of severe stress, the pain pathways may become over-active, so that the nervous system amplifies signals from the gut or produces pain on its own. Anxiety, low mood, poor sleep, past trauma and other pain conditions (for example fibromyalgia or migraine) can make this more likely and can make the pain stronger. It is not caused by something you did and it is not "imaginary".
Symptoms
- Constant or nearly constant belly pain, sometimes with flares
- Pain that is not clearly linked to meals, bowel movements or periods
- Pain that may be severe and limits daily activities, work or sleep
- Other symptoms such as nausea, tiredness, headaches or back pain
- Low mood, worry or feeling overwhelmed by the pain
- Normal tests, exam and weight
Red flags — seek urgent medical care
Sudden severe pain, a rigid belly, fever or repeated vomiting
Do not assume it is your usual pain. This could be a new emergency; go to the emergency department.
Vomiting blood, black stools, or blood in the stool
Signs of bleeding. Emergency care is needed.
Unintended weight loss, persistent fever, night sweats or difficulty swallowing
These point away from a functional disorder and need prompt medical investigation.
Yellow skin or eyes, or a new lump in the belly
Needs urgent assessment for liver, bile duct or other organ disease.
Thoughts of harming yourself or feeling unable to cope
Chronic pain can be exhausting. Seek help right away from your doctor, a crisis service or emergency care.
How is it diagnosed?
The diagnosis is made from the pattern of symptoms and a normal physical examination, after checking for conditions that can cause similar pain. Basic blood and stool tests are usually done, and imaging or endoscopy only if your symptoms or red flags call for them. Repeating the same tests rarely helps and can add worry and risk. A good relationship with one doctor who coordinates your care is one of the most helpful parts of treatment. Your doctor decides which tests are justified.
What the latest science says
Research has shown that treatments aimed at the brain-gut axis, including low-dose nerve-modulating medicines and psychological therapies such as cognitive behavioural therapy and gut-directed hypnotherapy, can reduce pain and improve function. Avoiding repeated opioid medicines is recommended because they can make this type of pain worse over time.
Outlook — what to expect
The condition is not life-threatening and does not damage the bowel. It can be long-lasting, but many people improve with the right team and treatment. Success often means better function and a lower burden of pain, rather than complete disappearance of pain, and this improves over time with a steady, supportive approach.
Treatment
Habits & Lifestyle
Daily routines are a core part of treatment because they help retrain the nervous system.
- Keep a regular daily routine with set times for sleep, meals and activity
- Build up gentle exercise gradually, such as walking, even on days with pain
- Practise relaxation, slow breathing, mindfulness or yoga-style stretching
- Prioritise good sleep and limit alcohol and nicotine
- Set small, realistic goals and track what you can do, not only the pain level
Diet
Food is rarely the cause. Restrictive diets can make matters worse, so seek guidance.
- Eat regular balanced meals; avoid skipping meals
- Do not cut out many foods on your own; see a dietitian if you suspect particular triggers
- Stay hydrated and limit excess caffeine
Medications
Medicines that calm pain pathways are the main option. Your doctor decides which and how to use them, and they often take weeks to work.
- Low-dose nerve-modulating medicines (certain antidepressant-type medicines) are used for pain, not only for mood
- Other medicines that act on nerve pain may be tried
- Avoid opioid (narcotic) painkillers, which tend to worsen this type of pain and can cause serious problems such as dependence
- Take medicines regularly as prescribed and report side effects rather than stopping suddenly
Procedures & Surgery
Procedures are generally not helpful and may do harm. Psychological and supportive therapies are the most useful "interventions".
- Cognitive behavioural therapy and gut-directed hypnotherapy have good evidence for gut-brain pain disorders
- A pain clinic or multidisciplinary pain team can provide combined care
- Repeated endoscopy, scans or surgery without a clear indication are not recommended
Living with the condition
- Your pain is real. Recovery is about learning to live well with less pain over time, with support.
- Share your plan with family so they can encourage activity and understand your limits.
- If pain begins to feel overwhelming or hopeless, tell your doctor; support is available.
Questions to ask your doctor
Save this list or print it before your appointment — doctors appreciate prepared patients.
- How do you know my pain is not from a hidden disease?
- Which medicine do you suggest, and how long before I notice a benefit?
- Can I be referred for psychological therapy or a pain clinic?
- Which tests are really needed, and which should I avoid repeating?
- How can I stay active and keep working with this pain?
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Status: Approved for publication by SGA; individual clinician review is ongoing · Published 24/04/2026
For general education only; it does not replace your doctor’s advice. Individual clinician review of this guide is ongoing. SGA clinician? Review this guide