Adrenaline: When someone gets startled or frightened, their adrenal glands squirt out a bit of adrenaline, the flight or fight hormone that creates a sense of urgency. Also, the spinal reflexes are activated. The combination of the two may activate the sensory nerves in you shoulder, causing that prickly sensation. Why the left shoulder? That's a mystery.
Answered 6/20/2017
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A doctor has provided 1 answer
A doctor has provided 1 answer
4 doctors weighed in across 2 answers
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