That genuine smile, which brings up the corners of the mouth and creates crow's feet around the eyes, can reduce the pain of a needle injection by up to 40%, and also blunt a stressful needle-related physiological response by lowering the heart rate, the researchers said.
from WebMD Health https://www.webmd.com/lung/news/20201204/smile-when-you-get-that-covid-vaccine-itll-hurt-less?src=RSS_PUBLIC
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