text: can a person born without a thyroid pass the problem on to future generations ? they found out i had no thyroid when i was two years old (extremly rare) because i was having seizures and my teeth weren't coming in.  many, many tests were taken on me.. the doctors called me a miricle. the doctors said i'd never have kids but somehow i was given the miricle of children. so far in their twenties my kids seem to be alright but put weight on easy. they have been tested. i wonder if it is possible for them or their children to have problems down the line. only 2% of cases of congenital hypothyroidism are hereditary, so it is unlikely that your grandchildren will have any problems.  even if they do, *all* newborns in the u.s. are tested for this before they leave the hospital--so it would be discovered right away.  as long as they took their synthroid, they would be normal kids and grow up to be normal adults.