When we complain, our brains release the stress hormone cortisol. Extra cortisol impairs our immune systems, making us more susceptible to illnesses, even heart disease, and stroke. Some studies suggest that the constant stress of complaining is linked to shrinkage in the hippocampus, a region of the brain that’s involved in emotional control, memory storage and recall, and learning. So complaining damages our brains and makes us sick.
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