It can be hard to know if you have COVID-19 since it shares symptoms with many other conditions. The best way to know for sure is to get a test, which uses a swab of fluid from your nose or throat. Signs of COVID-19 are a fever, cough, and trouble breathing. If you believe you have COVID-19 and your symptoms are mild, call your doctor to find out what you should do. Use our COVID-19 Symptom Checker to decide when to see a doctor.