What is the #1 risk factor associated with Thyroid Eye disease?

• A. Smoking
• B. Hyperlipidemia
• C. Sedentary lifestyle
• D. Alcohol use

Answer: (A)

Smoking is the single most important modifiable factor that increases both the risk of developing Thyroid Eye Disease and how aggressively it progresses. In people with Graves’ disease, smokers are more likely to develop orbitopathy, and their disease tends to be more active and severe—with more pronounced proptosis, eye muscle involvement, and a higher risk of optic nerve compression. They also generally respond less well to treatments like steroids or radiation.

The reasons behind this aren’t completely understood, but smoking boosts oxidative stress and orbital tissue hypoxia, amplifies inflammatory activity, and can promote fibroblast activation and tissue remodeling in the orbit. It may also intensify the autoimmune response targeting orbital tissues. Because smoking is modifiable, cessation is strongly advised and can improve prognosis.

The other factors listed don’t have a proven, direct link as risk factors for Thyroid Eye Disease. They affect overall vascular or metabolic health but aren’t established drivers of GO development or progression.