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â¢ Sinus infection involves the sinus cavities of the skull, whereas the cold only involves the mucous membranes. â¢ Sinus infection is mainly due to bacterial, whereas the cold is due to viral agents. â¢ The headache in sinus infection is much heavier than in the cold, with the heaviness aggravating when bending forward.
Viral infections that lead to sinusitis may be contagious; bacterial sinusitis is generally not. Itâs important to remember that most viral upper respiratory infections (common colds) cause nasal congestion, which may involve the sinuses. If the viral sinus infection lasts well past the normal duration of a cold, viral sinusitis may be diagnosed. These viruses are highly contagious and likely to cause a cold in others who come in contact with them. Bacterial sinusitis most often occurs as a complication of a viral common cold. Bacteria that are normally present in the nose and throat take advantage of the viral infection to invade the inflamed sinus passages.