30 Thyroid Symptoms That Are Too Important to Ignore

16. You Have Vision Disturbances

If you've been noticing that your eyes feel dry, irritated, or you're having trouble focusing, it could be more than just the weather or allergies. Hyperthyroidism can affect your eyes, causing symptoms like blurry vision or dryness. And for those with severe hyperthyroidism, like Graves' disease, the eyes can even start to bulge---a condition called proptosis.