Swollen eyes are a common symptom of thyroid eyes. As the immune system attacks the cells around the eye, usually the orbit, the area of your skull where your eyeballs sit, leads to inflammation. It causes the expansion of muscles, fat and other tissues in the area. Also, people with thyroid eye conditions may experience other symptoms such as:
Redness in the white part of your eyes
Pain and stress
Dry or watery eyes
Double the power of vision
Pain in the eyes when looking in different directions
Depending on the severity of the condition and the availability of treatment, the condition of the thyroid eye may go away within the remission period. It can be a problem for six months or a year, disappear for a while and get repaired. If it remains inactive for one year, it is less likely to recur. Symptoms may worsen in regular smokers.