Acute Chest Pain: Could This Be Acute Coronary Syndrome?
How to recognise possible acute coronary syndrome at the pharmacy counter, understand why ACS can mimic indigestion, identify atypical presentations, and know when to call 999, refer urgently, 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. Acute coronary syndrome (ACS) can present with symptoms that patients describe as indigestion, heartburn, trapped wind, reflux, or upper abdominal discomfort. Symptoms that appear consistent with reflux do not exclude acute coronary syndrome.
Atypical presentations of ACS are common and are regularly missed. Women, older adults, and people with diabetes may present with unexplained breathlessness, epigastric discomfort, nausea, collapse, dizziness, or profound fatigue rather than classic chest pain. These presentations are just as dangerous as the textbook picture.
Community pharmacy assessment cannot safely exclude acute coronary syndrome. NICE CG95 and NG185 are clear that any chest pain of possible cardiac origin requires urgent assessment. When doubt exists, urgent medical assessment is always the correct action.
Chest pain has a broader differential than cardiac and gastrointestinal causes alone. Musculoskeletal pain, pulmonary embolism (PE), pleurisy, pneumonia, costochondritis, panic disorder, and aortic pathology can all present with chest symptoms. The pharmacist's role is not to diagnose but to identify features that demand urgent escalation.
New-onset upper gastrointestinal symptoms in a patient aged 55 years or over may 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 the chest |
| Location | Epigastric or retrosternal burning, localised | Central or left-sided chest pain radiating to the jaw, neck, one or both arms, shoulders, or back |
| Duration | Symptoms fluctuate with meals, posture, or antacids | Persistent symptoms lasting more than 15 minutes that do not resolve with antacids or position change |
| Onset and exertion | Gradual; related to meals, lying down, or spicy food | Triggered by exertion, climbing stairs, or emotional stress; sudden onset at rest; unrelated to meals |
| Relieving factors | Improved by antacids or sitting upright | Not relieved by antacids; may appear to improve briefly then return; worsens with exertion |
| Associated symptoms | Belching, bloating, regurgitation | Sweating, breathlessness, nausea, pallor, dizziness, collapse, or a sense of impending doom |
| Atypical ACS | Symptoms clearly linked to eating or posture | Unexplained breathlessness, epigastric discomfort, nausea, collapse, or fatigue in women, older adults, or people with diabetes: may represent ACS without classic chest pain |
| Cardiac history | Known reflux, recent dietary change, pregnancy | Previous MI, angina, PCI, CABG, hypertension, diabetes, smoking, or strong family history of premature cardiovascular disease |
What to ask and look for
A brief targeted assessment helps identify patients requiring immediate escalation from those who can be safely managed with advice or referral.
- How old is the patient, and do they have any history of heart attack, angina, PCI, CABG, or known coronary artery disease?
- How long have the symptoms been present, and did they come on suddenly or gradually?
- Is the discomfort brought on by exertion, climbing stairs, or emotional stress? Does it settle promptly with rest?
- Is there associated breathlessness, even without chest pain? Any dizziness, collapse, or feeling of passing out?
- Any sweating, pallor, nausea, or a sense that something is seriously wrong?
- Is the pain clearly linked to meals, posture, or dietary triggers, and does it respond to antacids?
- What medicines is the patient taking? NSAIDs, bisphosphonates, doxycycline, potassium supplements, and iron tablets can all cause or worsen dyspepsia and upper gastrointestinal symptoms.
- Look for: pallor, diaphoresis (cold or clammy sweating), cyanosis, or signs of acute distress. These features require immediate action regardless of the history given.
Chest pain has a broader differential than cardiac and gastrointestinal causes. Consider musculoskeletal chest pain or costochondritis (localised tenderness on pressing the chest wall), pulmonary embolism (pleuritic pain, breathlessness, recent immobility), pleurisy, pneumonia, panic disorder, and in severe sudden tearing chest pain radiating to the back, possible aortic dissection. The pharmacist's role is not to diagnose but to escalate appropriately.
Do not be reassured by...
ACS is frequently missed because of false reassurance. The following features do not reduce cardiac risk and should not be used to rule out a cardiac cause:
- Temporary improvement after antacids: ACS can appear to improve briefly and then return.
- Absence of severe pain: ACS can present as mild pressure, tightness, or discomfort rather than dramatic pain.
- Normal or well appearance: a patient may look entirely well in the early stages of an acute coronary event.
- Younger age: ACS can occur in younger patients, particularly those with diabetes, a strong family history, or other cardiovascular risk factors.
- Absence of radiation to the arm or jaw: many ACS presentations do not radiate.
- Atypical symptoms: breathlessness, nausea, epigastric discomfort, or collapse without chest pain can represent ACS, particularly in women, older adults, and people with diabetes.
Symptoms that appear consistent with reflux do not exclude acute coronary syndrome. If there is any doubt, urgent medical assessment is always the correct action.
What to do in pharmacy
Do not rely on symptom characteristics alone to exclude ACS. Atypical presentations are common: a woman, an older adult, or a patient with diabetes may present with breathlessness, epigastric discomfort, nausea, or collapse as the predominant symptom. Temporary improvement with antacids, absence of severe pain, or younger age does not reduce cardiac risk. When in doubt, call 999.
Where ACS is strongly suspected, emergency services have been contacted, and the patient is conscious with no known aspirin allergy and no active bleeding, administration of 300 mg aspirin (chewed, not swallowed whole) may be appropriate in accordance with local protocols. Do not delay calling 999 to administer aspirin.
Sudden pleuritic chest pain with breathlessness, haemoptysis (coughing up blood), collapse, or a history of recent immobility should raise suspicion of pulmonary embolism and requires emergency assessment.
Refer for same-day or next-day assessment for: a patient aged 55 years or over with new or unexplained upper gastrointestinal symptoms, in accordance with NICE NG12; or new upper gastrointestinal symptoms that are not clearly explained by a recognised cause, are not responding to over-the-counter treatment, or are associated with alarm features. Alarm features requiring urgent referral on a suspected cancer pathway include weight loss, dysphagia, haematemesis (vomiting blood), or persistent vomiting.
Remember that community pharmacy assessment cannot safely exclude ACS. If there is any uncertainty about whether chest symptoms may be cardiac in origin, urgent medical assessment is always the correct action.
Advise over-the-counter antacids or a short course of a proton pump inhibitor for up to two weeks, alongside lifestyle measures: eating smaller meals, avoiding known trigger foods, not lying down within two to three hours of eating, elevating the head of the bed, and reducing alcohol and caffeine intake.
If a prescribed medicine may be contributing to symptoms (particularly NSAIDs, bisphosphonates, doxycycline, potassium supplements, or iron preparations), advise the patient to discuss this with their GP before stopping any prescribed treatment.
Safety-net: advise the patient to seek urgent 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, radiation to the arm or jaw, dizziness, or collapse, call 999 immediately.
Key takeaways
- Acute coronary syndrome can present as indigestion, heartburn, or epigastric discomfort. Symptoms that appear consistent with reflux do not exclude ACS. Community pharmacy assessment cannot safely exclude acute coronary syndrome.
- Do not be reassured by temporary relief with antacids, absence of severe pain, younger age, or lack of radiation. Atypical ACS is common in women, older adults, and people with diabetes.
- Any new exertional chest discomfort is possible angina and requires prompt clinical assessment. When in doubt about any chest symptom, call 999 or arrange urgent medical assessment.