Someone with COVID-19 usually has mild, flu-like symptoms (see above question 1), which are rather common and need to be distinguished from similar symptoms caused by common cold viruses and from allergic symptoms during springtime.
The following table presents a comparison of the most common symptoms of all three conditions according to their reported frequency.
It is good to bear in mind that the definitive diagnosis of COVID-19 is not clinical, but through laboratory testing of a sample from the nose or mouth.
Table: comparison of common symptoms between common cold, hay fever and COVID-19
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Source: ECDC (European Centre for Disease Prevention and Control)