COVID symptoms overlap with the symptoms of many cold related ailments. Therefore, it becomes extremely difficult to figure out whether one is infected with coronavirus or if it is something else unless and until one tests for COVID.

from Times of India https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/coronavirus-know-if-it-is-summer-cold-or-covid-19/photostory/90444744.cms