As allergist Sara Narayan, MD, wrote in an article for Emerson Hospital in Massachusetts, one surefire sign that your nasal congestion might be caused by COVID is when you take allergy medication and it doesn’t provide any relief. That’s a pretty good indication that your stuffy nose is being caused by something other than allergies. And for help treating coronavirus if you do become infected, check out This Common Medication Could Save You From Deadly COVID Complications. Never had seasonal allergies before? Then you most likely don’t have them now either. Depending on how long your congestion persists and what other symptoms you have, you could have a cold, the flu, and, yes, even COVID, though Narayan says it’s rare. And for more helpful information delivered to your inbox, sign up for our daily newsletter.ae0fcc31ae342fd3a1346ebb1f342fcb If you have a fever in addition to your stuffy nose, then you definitely want to consider seeing a doctor. According to Narayan, allergies almost never cause you to have a fever. However, the symptom is very common in cases of the flu, as well as the novel coronavirus. Of course, both of those illnesses should be taken very seriously. And for tips on distinguishing one from the other, know that This One “Wacky” Symptom Means You Have COVID, Not the Flu. The same goes for body aches, Narayan writes. You will almost never experience the symptom due to allergies, but very commonly will with COVID. And to learn more about where the virus is heading, check out 10 States on the Verge of COVID Surges.