The vagus nerve passes right by the ears. Gentle pressure stimulates the nerve. The vagus nerve plays a part in the generation of oxytocin, the hormone at brain uses to trigger feelings of relaxation. So rubbing your ear canal with a q-tip makes you feel calm and relaxed.
Unfortunately it also gets dangerously close to your eardrum, risking irreparable damage and hearing loss for a momentary feeling of relaxation. Also, q tips aren’t the best for cleaning out ear wax, and can sometimes lead to just stuffing it down into the ear and hearing loss that way. So it’s better to just use some warm water and gently spray it in to clean out your ears.
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