My second oldest sister ended up having most of her thyroid removed because she was diagnosed with hyperthyroidism. They never put her on any thyroid medication until she was in her 60's. I've been told thyroid problems are hereditary, and that they occur mostly in women, but men can, and do develop problems. Neither parent was ever diagnosed with thyroid issues. My niece (brother's daughter) was diagnosed with hypothyroidism when she was in her teens. I have two sons in their 50's. Neither has beed diagnosed with thyroid issues.
I take 50MCG, since they removed most of mine. 😊😆