Have you ever lost sleep or struggled with daily life due to back pain? Many people assume back pain is merely a posture issue or muscle pain and try to endure it with a transdermal analgesic patch. However, it is essential to remember that back pain may actually stem from a heart problem. This is because back pain can be referred pain from cardiovascular disease.
Referred pain refers to a phenomenon where a problem in a specific internal organ is felt not in the organ itself, but in a completely different part of the body. Because our nervous system is intricately wired, when pain signals from the heart travel to the brain, the brain can mistake those signals as originating from the back, arm, or jaw instead of the heart. In particular, referred pain related to heart disease often appears in the left arm, shoulder, jaw, mid-back, or left scapula. It is as if the heart is shouting that it is in trouble, but the brain mishears it as back pain.
Angina pectoris, a representative cardiovascular disease, refers to chest pain that occurs when the blood supply to the myocardium becomes insufficient. This pain presents as a pressing sensation or tightness in the center of the chest, but many patients experience this pain radiating to the left shoulder, arm, neck, jaw, or even the back. It tends to worsen during exercise, under stress, or when exposed to cold temperatures. If such pain is felt in the back, you should not dismiss it as a stiff shoulder, but suspect heart health instead.
An even more dangerous condition is myocardial infarction. This is a medical emergency where the blood vessels leading to the myocardium become completely blocked, causing the myocardium to undergo necrosis. The pain here is far more intense and prolonged than in angina pectoris, often described as a squeezing or stabbing sensation. Crucially, this extreme pain is not confined to the chest; it can radiate to the back, arms, neck, or jaw. If severe pain suddenly strikes the mid-back or left back accompanied by cold sweats, nausea, and dyspnea, it is a true emergency where the golden hour must not be lost.
Why does such referred pain occur? The heart and the skin and muscles of the back share the same spinal segment in the spinal nerve. That is, they transmit signals to the brain through the same nerve fascicle. The brain cannot accurately distinguish between pain signals coming from these two areas and can mistakenly perceive that the pain arose from the more familiar, broader back area. Therefore, please remember that heart disease can manifest as back pain alone without chest pain. If you experience the aforementioned symptoms—back pain accompanied by chest pain, back pain that worsens with exertion and eases with rest, or systemic symptoms like cold sweats, dyspnea, and nausea—you must visit a nearby hospital emergency room without delay. Never forget that paying close attention to the small signals sent by your body is the most important first step in protecting your health.
