With overlapping symptoms like fever, sore throat, runny nose, cough, fatigue, headaches and body ache, it can be hard to differentiate between Covid-19 and flu.

A person may still be able to get the flu shot when sick with mild illnesses, such as colds and sinus infections. However, a doctor may recommend delaying the shot if the person has severe symptoms.

Symptoms of sinusitis primarily include nasal congestion and pain in the area of the affected sinus, most commonly in the forehead or cheeks on one or both sides of the nose.

For instance, a cold, the flu, and sinus infections can all cause stuffy noses. "Illness-related congestion usually improves within 1-2 weeks.

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