When we are angry or stressed, we may see a clenching of one’s jaw or the grinding of teeth. When we’re nervous or afraid, we may see the biting down of lips, tightening of the mouth, or twisting the lips to one side. Dry mouth is also a common symptom of nervousness, which can be tipped off by exaggerated swallowing. Another big tell is frequent sighs or yawns. Although the science as to why is not yet fully understood, it appears that we tend to yawn more when under heightened states of stress. This is partially due to the fact that stress causes our body to heat up and so, when our brains
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