Why chest pain in angina is radiating to the left inner arm and upper jaw?

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Cardiac pain of angina is often referred to areas of the body surface which send sensory impulses to the same levels of the spinal cord that receive cardiac sensation. This is true especially on the left side. The sensory nerve fibers from the heart connective tissue and blood vessel walls travel through the cardiac plexus, sympathetic chain, and up to the dorsal roots and ganglia of spinal nerves T1-T4. From these ganglia in thoracic region - there is interconnection with ganglia in cervical region Anginal pain radiates to left side - because heart is located in left side and afferent nerves stimulates left side dermatome nerve fibers Some times even cervical nerve fibers gets stimulated - therefore pain is also referred to left jaw

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The nerves that branch from the heart and those coming from the arm send signals to the same brain cells. As a result, the brain cannot isolate the source of the pain. But symptoms of heart attack can include pain in the right arm, left arm, or both arms.And pl.note that Angina is not a heart attack. However, it is a sign of a heart problem. Clogged or narrowed coronary arteries are often the cause of angina.

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It is referred pain, and is due to the fact that the spinal level that receives visceral sensation from the heart simultaneously receives cutaneous sensation from parts of the skin specified by that spinal nerve's dermatome

Afferant pain fibres supplied to jaw shoulder hand once ischemia occurs in heart Refral pain you feel at mentioned places

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It's referred pain ,which is due to sensory overlap at the CNS

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