I searched for this topic but didn't find many results but apparently there is a correlation between thyroid disease and premature greying of the hair so I would like to know if anyone here has found this, if you don't mind sharing your experiences.
I haven't been diagnosed yet I strongly suspect I do have hypothyroidism based on many symptoms I've been getting over the past few years that have gradually worsened (dry, brittle, lifeless hair, dry skin, tiredness after adequate amount of sleep, visual problems despite previously having near-perfect vision, sensitivity to cold, recurring mouth ulcers, brain fog, depression etc.)
The grey streak in my hair is just the latest in a series of odd symptoms, I'm not saying it is 100% thyroid-related obviously but at my age it is quite unusual for this to be down to genetics. Of course I might have a vitamin deficiency which mimics thyroid disease. I have had a basic thyroid profile test via my GP but, like many of you, it was "normal" and despite my protests, that was the end of the conversation and no further tests were carried out. As usual, the GP knew best and all of my physical symptoms were really mental (he said in so many words).
If anyone else developed hypothyroidism around my age and experienced the premature greying I'd be interested to hear about it. I also want to say this is a great forum and a lot of you are understandably very knowledgeable about thyroid disease in a way that unfortunately most GPs are not.