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A headache does not mean one has a brain tumor, but some brain tumors do cause headaches. Likewise, ADHD behaviors do not mean one has a food allergy, albeit some food allergies cause, in some children, behaviors that are on the official list of ADHD symptoms.

If you have signs or symptoms of COVID-19, it's important that you contact your health care provider right away for medical advice. But COVID-19, the common cold, seasonal allergies and the flu cause many similar symptoms.