Is it true that after total thyroidectomy your lifespan will be 10yrs only?

No, this is not true. A total thyroidectomy is a surgical procedure to remove the entire thyroid gland. The thyroid gland produces hormones that regulate metabolism and growth. After a total thyroidectomy, patients will need to take thyroid hormone replacement medication to maintain normal thyroid function. With proper medical care and treatment, patients who have undergone a total thyroidectomy can expect to have a normal lifespan.