Could numbness of lips and left hand be a warning of a thyroid problem?

Numbness of the lips and left hand would be unusual symptoms of an over active thyroid gland (hyperthyroidism). The most common causes of numbness or tingling in the lips and hands is hyperventilation or a low blood calcium level. Since hyperthyroidism increases a person’s metabolic rate and can sometimes lead to faster breathing, it’s biologically plausible to make the connection between these symptoms and hyperthyroidism.