I think it would have to do with your circulation..? Decreased Circulation to be precise.
It's when someone changes mood extremely fast for example happy to sad or angry to happy etc
<em>Vaccines work by simulating an illness to help establish immunity. However, while this sort of infection nearly never produces sickness, it does trigger the immune system to create T-lymphocytes and antibodies. The imitation illness can sometimes induce modest symptoms, like as fever, after receiving a vaccination.</em>
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<em>- RobertOnBrainly</em>
