So, What Heart Conditions Might Arm Pain Indicate?

Arm pain is most commonly caused by something musculoskeletal, a pulled muscle, a trapped nerve, tendinitis, or a problem with the shoulder or neck. But arm pain can also be a symptom of an underlying heart condition, and this is one of the most well-known warning signs of a heart attack. The mechanism behind it is referred pain, the heart and the arm share nerve pathways that feed into the same part of the spinal cord, so when the heart is under strain the brain can interpret the discomfort as coming from the arm rather than the chest. Recognising when arm pain might be cardiac, and when it almost certainly is not, can be the difference between a quick call to a GP and a call to 999.

In our experience at our Tunbridge Wells clinic, the patients most often caught out by arm pain are those whose symptoms appear in isolation, with no obvious chest pressure to accompany them. From working with patients across Kent and East Sussex since 2006 at West Kent Cardiology Partnership, we have found that cardiac arm pain rarely behaves like a muscle injury. It does not improve with stretching, it is not made worse by pressing on the affected area, and it often comes on with exertion rather than with movement of the arm itself. If your arm pain follows that pattern, particularly with breathlessness, sweating, or a sense that something is wrong, you should treat it as urgent.

Why heart problems can cause arm pain

The heart and the upper limbs share part of the same nerve supply, particularly the nerves entering the spinal cord at the upper thoracic levels (T1 to T4). When the heart muscle is starved of oxygen, irritated, or under unusual strain, the pain signals travel along these shared nerve pathways and the brain can struggle to identify the true source. The result is pain that is felt in the arm, shoulder, jaw, or upper back, rather than in the chest itself.

Because of how these nerves are wired, the left arm is the most commonly affected, but the right arm, both arms, or the shoulders can also be involved. This is why cardiac arm pain is not exclusively left-sided, and right-sided or bilateral arm pain should not be dismissed.

In our experience, patients describe cardiac arm pain as a dull ache, heaviness, pressure, or tingling sensation rather than the sharp, stabbing pain that is more typical of a muscle or nerve injury. It often feels deep within the arm rather than at the surface, and it is not relieved by changing arm position or pressing on a particular spot.

Heart attack

Arm pain is one of the classic recognised warning signs of a heart attack. NHS guidance specifically lists pain that spreads from the chest to the arms (usually the left arm, but it can affect both arms) as a key heart attack symptom alongside chest pain, breathlessness, sweating, and nausea.

In a heart attack, a coronary artery becomes blocked and a section of the heart muscle is starved of oxygen. The classic presentation is central chest pain or pressure radiating down the left arm, but in around one in three cases the arm pain is more prominent than the chest discomfort, and in some patients the arm pain appears without any chest pain at all. This is more common in women, older adults, and people with diabetes, all groups in whom heart attacks frequently present atypically.

In our experience, around 10 to 15% of patients we assess who turn out to have had a heart attack first reported arm or shoulder pain rather than chest pain. From working with patients, we have found that the most overlooked presentation is heaviness in the left arm with mild breathlessness on exertion, dismissed for days or even weeks as a frozen shoulder, gym injury, or stress. In our experience, treating new, unexplained left arm pain that comes on with exertion as a possible cardiac event works better than waiting for chest pain to develop, because once the heart muscle starts to die the window for effective treatment is short.

Angina

Angina is the chest discomfort caused by reduced blood flow to the heart muscle when the coronary arteries are narrowed, usually by atherosclerosis. Although chest pain is the classic feature, angina commonly causes pain that radiates down the left arm or both arms, and in some patients arm pain is the predominant symptom.

What makes angina-related arm pain distinctive is its relationship to exertion. It typically appears during physical activity, after a heavy meal, in cold weather, or with emotional stress, and it usually eases within a few minutes of stopping the activity or resting. The pain often returns each time the patient tries to push themselves to the same level of effort.

There is a category between stable angina and a fully developed heart attack called acute coronary syndrome, which includes unstable angina. Unstable angina is angina that occurs at rest, has become more frequent or severe, or no longer responds to its usual triggers and treatments. Arm pain in unstable angina behaves differently from stable angina, it can come on without warning, last longer, and not settle promptly with rest.

From working with patients in our Tunbridge Wells clinic, we have found that exertional left arm pain that consistently resolves within five minutes of rest is one of the most reliable signs of stable angina. In our experience, asking patients to keep a brief diary of when their arm pain occurs works better than relying on memory at consultation, because the link to specific triggers becomes clear when written down. Stable angina is not life threatening in itself, but it is an important warning sign that the coronary arteries need urgent assessment to prevent a heart attack.

Unstable angina and acute coronary syndrome

In our experience, the change in pattern is more important than the severity of any individual episode. From working with patients, we have found that patients who develop new arm pain at rest, or whose previously stable exertional arm pain begins occurring with smaller and smaller amounts of effort, should be assessed urgently because the risk of progressing to a heart attack in the days that follow is high.

Pericarditis

Pericarditis is inflammation of the sac that surrounds the heart. The pain is usually felt centrally in the chest and is often sharp rather than crushing, but it can radiate to the left shoulder and arm via the same shared nerve pathways that cause cardiac referred pain.

What distinguishes pericarditis from a heart attack is the character of the pain. It is often made worse by lying flat and improved by leaning forward, and it typically gets worse with deep breaths or coughing. The pain frequently follows a viral illness in the preceding week or two.

In our experience, pericarditis is much less common than coronary artery disease as a cause of cardiac arm pain, but it remains an important diagnosis to consider, particularly in younger adults who present with shoulder or arm pain after a recent viral infection.

Aortic dissection

Aortic dissection is a rare but serious condition in which a tear develops in the wall of the aorta, the large artery that carries blood away from the heart. The classic symptom is a sudden, severe tearing pain felt in the chest or between the shoulder blades, and the pain can radiate to the arms, neck, or jaw.

Aortic dissection is uncommon and the arm pain it causes is usually accompanied by very severe central pain and a striking sense of acute illness. It is more likely in people with poorly controlled high blood pressure, connective tissue conditions such as Marfan syndrome, or a history of aortic aneurysm.

Other, more common causes of arm pain

Most arm pain is musculoskeletal. Common non-cardiac causes include rotator cuff problems, frozen shoulder, tendinitis, cervical radiculopathy (a pinched nerve in the neck), tennis elbow, golfer’s elbow, repetitive strain injury, and direct muscle or joint injury. These typically cause pain that is reproducible by movement or pressure, worsens with specific actions, often improves with rest or anti-inflammatories, and is not associated with breathlessness, sweating, or exertional symptoms.

From working with patients, we have found that the clearest way to distinguish musculoskeletal arm pain from cardiac arm pain is the relationship to activity. Musculoskeletal pain is brought on by movement of the arm or pressure on a specific area. Cardiac pain is brought on by general physical exertion such as walking uphill or climbing stairs, regardless of what the arm is doing, and is relieved by rest rather than by repositioning the arm.

When arm pain is more likely to be heart related

Certain features should raise concern that arm pain may be cardiac in origin. These include pain that comes on with physical exertion and eases with rest, pain that is dull, heavy, or pressure-like rather than sharp, pain that does not respond to changing arm position or pressing on a specific spot, pain that is accompanied by breathlessness, sweating, nausea, or jaw discomfort, and pain in a patient with established risk factors for heart disease such as high blood pressure, high cholesterol, diabetes, smoking, or a family history of coronary disease.

In our experience, patients with two or more cardiac risk factors who present with new, unexplained arm pain benefit from a baseline cardiac assessment such as our HeartScreen programme, even when other symptoms appear mild. From working with patients referred from local GPs, we have found that around 1 in 5 patients in this group are found to have a meaningful cardiac issue on assessment that would otherwise have gone unrecognised.

How heart-related arm pain is investigated

Assessment begins with a careful history of when the arm pain occurs, what brings it on, how long it lasts, and what other symptoms accompany it. The initial tests usually include an ECG to look at the heart’s rhythm and signs of ischaemia, blood tests including troponin if a recent cardiac event is suspected, and an echocardiogram to assess the structure and function of the heart muscle and valves.

Depending on the findings, further tests may include an exercise stress test to look for exertional cardiac symptoms, a stress echo study to see how the heart performs under load, or a CT coronary angiogram for direct imaging of the coronary arteries. For patients with palpitations alongside their arm pain, a 24-hour ECG recording or 7-day cardiac event recorder may also be appropriate. Most of these investigations can be arranged on-site at our consulting rooms in Tunbridge Wells, with results discussed in a single follow-up consultation.

When to seek urgent help

Call 999 immediately if arm pain occurs alongside chest pain, severe breathlessness, sweating, collapse, or pain spreading to the jaw, neck, or back. These are signs of a possible heart attack and need emergency assessment.

For arm pain that is recurrent, occurs with exertion, or appears alongside other heart symptoms such as palpitations, breathlessness, or unusual fatigue, arrange a cardiology assessment rather than waiting for symptoms to progress.

Conclusion

Arm pain is rarely the first symptom people associate with heart disease in themselves, but it is one of the most important warning signs to recognise. The conditions most often responsible for cardiac arm pain are heart attack, angina, and unstable angina, with pericarditis and aortic dissection as rarer causes. The patterns that should raise concern are pain that comes on with exertion, pain that does not respond to movement or pressure, and pain that is accompanied by breathlessness, sweating, or nausea.

If you have been experiencing unexplained arm pain, particularly with any of the patterns described above, it is worth getting your heart properly assessed rather than assuming the cause is musculoskeletal. You can contact us, Dr Clive Lawson and Dr Derek Harrington at West Kent Cardiology Partnership, to arrange a consultation at our Tunbridge Wells clinic, or call us directly on 01892 526726.