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Acute Chest Pain: Cardiac or Gastrointestinal?
How to distinguish cardiac from gastrointestinal chest pain at the pharmacy counter, and when to call 999, refer to a GP, or advise self-care.
Why this matters
Community pharmacists are often the first healthcare professional a patient reaches when asking for antacids for indigestion, and some of those patients are in the early stages of an acute coronary event. The symptoms of myocardial infarction and gastro-oesophageal reflux can overlap considerably. Both can cause central chest or upper abdominal discomfort, and atypical presentations of acute coronary syndrome are common in women, older adults, and people with diabetes.
Missing a cardiac event is one of the highest-stakes errors in community pharmacy. NICE CG95 and NG185 are clear that any chest pain of possible cardiac origin requires urgent assessment. New-onset dyspepsia in a patient aged 55 years or over may also require GP referral to exclude upper gastrointestinal malignancy in accordance with NICE NG12.
Red flags vs more likely benign
| Feature | More likely benign | Red flag ⚠ |
|---|---|---|
| Character | Burning, gnawing, heartburn, acid taste | Pressure, tightness, heaviness, or crushing sensation, often described as "a weight on my chest" |
| Location | Epigastric or retrosternal burning, localised | Central or left-sided chest pain radiating to the jaw, neck, left arm, or back |
| Onset | Gradual; related to meals, lying down, or spicy food | Sudden or rapid onset; unrelated to meals; may occur at rest or with exertion |
| Relieving factors | Improved by antacids or sitting upright | Not clearly related to meals or reflux triggers; not relieved by antacids; may worsen with exertion |
| Associated symptoms | Belching, bloating, regurgitation | Sweating, breathlessness, nausea, pallor, or a sense of impending doom |
| Risk factors | Known reflux, recent dietary change, pregnancy | Hypertension, diabetes, smoking, known heart disease, or family history of heart disease |
What to do in pharmacy
Call 999 immediately for heavy, crushing, or pressure-like chest pain, especially if it radiates to the jaw, neck, left arm, or back, or is accompanied by breathlessness, sweating, nausea, pallor, or a sense of impending doom. Also call 999 for any chest pain in a patient with known heart disease or multiple cardiovascular risk factors that is not clearly consistent with simple acid reflux.
If acute coronary syndrome is suspected and the patient is conscious with no known aspirin allergy and no active bleeding, 300 mg aspirin should be chewed (not swallowed whole) while awaiting the ambulance. Do not delay calling 999.
If acute coronary syndrome is suspected and the patient is conscious with no known aspirin allergy and no active bleeding, 300 mg aspirin should be chewed (not swallowed whole) while awaiting the ambulance. Do not delay calling 999.
Refer urgently for medical assessment via a GP, NHS 111, or local pathways for: exertional chest discomfort that reliably settles with rest (possible stable angina); new-onset dyspepsia lasting more than two weeks and not responding to over-the-counter treatment; or new or unexplained upper gastrointestinal symptoms in a patient aged 55 years or over. Under NICE NG12, patients aged 55 years or over with dyspepsia and alarm features such as weight loss, dysphagia, haematemesis, or persistent vomiting should be referred urgently on a suspected cancer pathway.
Self-care is appropriate for clear, non-radiating epigastric burning that is closely related to meals, lying down, or dietary triggers, in a patient with no cardiovascular risk factors and no red flag features. Advise over-the-counter antacids or a short course of a proton pump inhibitor for up to two weeks, alongside lifestyle measures such as eating smaller meals, avoiding known trigger foods, elevating the head of the bed, and reducing alcohol and caffeine intake.
Safety-net: advise the patient to seek medical advice if symptoms persist beyond two weeks, fail to respond to treatment, or change in character. If symptoms become more suggestive of a cardiac cause, including chest tightness, breathlessness, sweating, or pain radiating to the arm, jaw, neck, or back, call 999 immediately. When uncertainty exists about whether symptoms are cardiac in origin, err on the side of caution and seek urgent medical assessment.
Safety-net: advise the patient to seek medical advice if symptoms persist beyond two weeks, fail to respond to treatment, or change in character. If symptoms become more suggestive of a cardiac cause, including chest tightness, breathlessness, sweating, or pain radiating to the arm, jaw, neck, or back, call 999 immediately. When uncertainty exists about whether symptoms are cardiac in origin, err on the side of caution and seek urgent medical assessment.
Key takeaways
- If you are uncertain whether chest pain is cardiac, seek urgent medical assessment. The consequences of missing a heart attack are far greater than over-referring. Atypical presentations of acute coronary syndrome are common in women, older adults, and people with diabetes.
- Chest pain that is not clearly related to meals, responds poorly to antacids, or occurs in a patient with cardiovascular risk factors should be considered potentially cardiac until proven otherwise.
- New-onset dyspepsia in a patient aged 55 years or over warrants GP referral under NICE NG12. Urgent referral on a suspected cancer pathway is required if alarm features such as weight loss, dysphagia, haematemesis, or persistent vomiting are present.
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Professional disclaimer: This article is for educational purposes
to support healthcare professionals' clinical decision-making. It does not replace
independent professional judgement, local pathways, NICE guidance, or standard
medical literature. Members of the public must not use this resource for
self-diagnosis and should seek prompt advice from a qualified healthcare
professional if experiencing chest pain, palpitations, fainting, or breathlessness.