It’s another chilly January, and that means it’s the season for runny noses, sore throats, coughing, and other sinus symptoms. But these symptoms can be telltale signs for more than just common colds or the flu, even in the midst of a severe flu season.

How to tell the myriad causes of these symptoms apart? How can nurses diagnose and differentiate illnesses with such similar signs? Our title Differential Diagnosis for the Advanced Practice Nurse explains how. Drawing from this title, which covers etiologies (causes of a disease or condition) based on 38 of the most common symptoms, we created this infographic explaining how you can diagnose four different medical conditions that share a single wintry symptom: rhinorrhea, or the classic runny nose.