Flu vs. Covid: Symptoms, Onset, and How to Tell

With similar symptoms, it can be challenging to differentiate between the common cold, flu, and Covid-19, especially as flu season intensifies and Covid is expected to circulate more widely. While a stuffy nose might suggest a cold, a hacking cough and full-body fatigue point towards viral infections like flu or Covid.

Doctors note that Covid symptoms often appear gradually, whereas flu can strike suddenly, leaving individuals feeling severely ill. Although both can cause a range of symptoms including fever and gastrointestinal issues, a key differentiator is symptom onset. Testing is highlighted as the most reliable method for distinguishing between these illnesses, with at-home tests offering quick results.

Given the overlap in symptoms and prevention strategies, including vaccination, frequent hand-washing, and avoiding crowds, testing is crucial for planning and proper treatment. This is particularly important for individuals at high risk of severe illness, enabling timely access to antiviral medications and helping to manage expectations regarding recovery time.