Sinus infection and cold are different words with related meanings. Sinus is the air-filled sacs behind the nose; it gets infected when your nasal passage is infected. The main difference between a sinus infection and cold is how long they linger.
Cold is an infection caused by a virus. Cold can lead to sinus infection. Sinus infection can be treated while cold cannot be treated. The Symptoms of cold are also the basic symptoms of the sinus virus. These symptoms include runny nose, headache, fatigue, sneezing.
When all these last longers, it shows other symptoms such as a reduced sense of smell, a fever that persists, pressure or pain between or around the eyes, persistent bad breath, pain in the teeth and nasal congestion, and discolored discharge.