Why Do Heart Attacks Cause *Arm* Pain?

From MinuteEarth.

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When the brain receives pain from an internal organ, it often projects the pain in the wrong place because of the way sensory nerve paths converge

To learn more about this topic, start your googling with these keywords:
– Nerve: a whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs.
– Nerve impulse: a signal transmitted along a nerve fiber. It consists of a wave of electrical depolarization that reverses the potential difference across the nerve cell membranes.
– Referred pain: pain perceived at a location other than the site of the painful stimulus/origin. It is the result of a network of interconnecting sensory nerves that supplies many different tissues.
– Sensory cortex: the region of the brain that deals with sensory information.

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Foreman, Robert D., et al. “Mechanisms of Cardiac Pain.” Comprehensive Physiology, 16 Mar. 2015, pp. 929–960, https://doi.org/10.1002/cphy.c140032

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Mense, S. “Neurobiologische Mechanismen Der Übertragung von Muskelschmerz.” Der Schmerz, vol. 7, no. 4, Dec. 1993, pp. 241–249, https://doi.org/10.1007/bf02529860

Mustafa Al-Chalabi, et al. “Neuroanatomy, Spinothalamic Tract.” Nih.gov, StatPearls Publishing, 8 Aug. 2022, https://www.ncbi.nlm.nih.gov/books/NBK507824/

Schultz, Harold D. “The Spice of Life Is at the Root of Cardiac Pain.” The Journal of Physiology, vol. 551, no. 2, Sept. 2003, pp. 400–400, https://doi.org/10.1113%2Fjphysiol.2003.050104

US), Medicine, et al. “The Anatomy and Physiology of Pain.” Nih.gov, National Academies Press (US), 2023, https://www.ncbi.nlm.nih.gov/books/NBK219252/