I ve a scenario for you. Say male pattern baldness does not run on either side of a young man s family. However, he notices his hairline starting to thin on one side at about 18 or 19 years old. It gets progressively thinner until about age 22, when follicles on both sides of his hairline seem to be in a resting phase. Other than using hair processing products a few times in his life, stress seems like the only culprit. Should he get his thyroid operation checked? How can this be reversed?