I had a Yunnan tea habit of about a pound a month for 26 months then found out my thyroid function went to almost zero. Blood tests a month after I stopped sho

I had a Yunnan tea habit of about a pound a month for 26 months then found out my thyroid function went to almost zero. Blood tests a month after I stopped showed heavy metal exposure down in the noise, so was it pesticides? Is it even related to the tea? I may never know. Now I'm on synthroid for the rest of my life.