What Causes Cheeks To Quiver While On Anti-depressants?
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Detailed Answer:
I read your question carefully and I understand your concern.
That distribution of the symptoms doesn’t correspond to a particular brain or peripheral nerve lesion. The location on both cheeks and the fact it happens only when smiling doesn’t related to a brain area or nerve.
At times electrolyte alterations (in particular calcium or magnesium) may be at fault as well as thyroid dysfunction. For that reason a routine test such as electrolyte panel and a recheck of thyroid function is advised.
However the main possibility in my opinion is simply anxiety. The fact that you are on antidepressants (often used for anxiety) and thyroid medication (thyroid dysfunction is often related to anxiety) indicates that you are an anxiety prone individual. So that together with the location indicates anxiety as the most probable cause.
I remain at your disposal for other questions.