Cold vs COVID: 20 Key Differences Everyone Should Know

13. Headaches: A Frequent COVID-19 Indicator

While colds can cause headaches due to sinus congestion, they are not a primary symptom. With COVID-19, headaches are significantly more common and often severe and persistent. Some COVID-19 patients experience debilitating, migraine-like headaches that linger for days, particularly in the early stages of infection. If you're experiencing an intense headache along with other symptoms, COVID-19 should be considered.

14. Changes in Heart Rate & Blood Oxygen Levels

COVID-19 can affect oxygen levels and heart rate, which is rare in a typical cold. People with COVID-19 sometimes experience silent hypoxia, meaning their blood oxygen levels drop dangerously low without them noticing severe breathing difficulties. A pulse oximeter—a small device that clips onto a finger—can help monitor this. Additionally, an elevated resting heart rate is another possible sign of COVID-19, especially in those recovering from the illness.