Can a sinus infection cause a drooping eyelid?

Yes, a sinus infection can cause a drooping eyelid, particularly if the infection affects the sinus cavities near the eyes, such as the ethmoid or sphenoid sinuses. This can lead to inflammation or pressure on the nearby nerves, potentially resulting in eyelid drooping. However, drooping eyelids can also be caused by other conditions, so it's important to consult a healthcare professional for an accurate diagnosis.