One clue for HASHIMOTO's which few people mention, but which I feel could be definitive, is the missing outer third of one's eyebrows. I suffered with undiagnosed Hashis for 25 years, starting as a a young mother with my first child. My eyebrows were normal, but I had every Hashi symptom, eventually, with one terrble flare, also undiagnosed, whch caused me to take a two year sabbatical from my private psychology practice, which I spent mostly lying in bed. Eyebrows were normal this whole time. The symptoms gradually resolved as my immune system weakened with age. Following the Moderna 1 vaccine in Jan of 2021, almost overnight. my eyebrows took on the Hashi's pattern of missing the outer portion along with a hugely elevated ANA, as well as the resurgence of all Hashi symptoms, along with a new, undiadnsed autoimmune disease. Long before this, after becoming a researcher of my various strange illnesses, which I finally recognized as autoimmune in nature, I had diagnosed my years of struggling wth extreme fatigue, lack of will (so opposite to my natural personality), extreme food sensitivity flares, a failing immune system, and elevated TSH, as Hashimoto's.