Can allergies cause swelling under both eyes in the morning that goes away afternoon and has lasted for 2.5 weeks?

While allergies can cause swelling around the eyes, it is uncommon for the swelling to be present only in the morning and resolve by the afternoon. Additionally, 2.5 weeks is a relatively long duration for allergic symptoms to persist without improvement. It is important to consider other potential causes for the swelling, such as infections, sinus issues, or thyroid problems.