Is there any pressure behind your eyes, or do you have a thyroid problme. My eyes started stinging about 6 years ago. It felt as if there was grit in my rt. eye. And there was pressure behind both eyes, along with nasty light sensitivity. Although I have Hashimoto's thyroiditis (hypothyroidism) , the dr. says I have Grave's disease (hyperthyroidism) eyes. No matter what it is called, I believe it is caused by mercury. <img src="/ubbthreads/images/graemlins/mad.gif" alt="" />