The results indicate that at least half of participants with COVID‐19 disease had a cough, sore throat, high temperature, muscle or joint pain, fatigue, or headache. However, cough and sore throat were also common in people without COVID‐19, so these symptoms alone are less helpful for diagnosing COVID‐19. High temperature, muscle or joint pain, fatigue, and headache substantially increase the likelihood of COVID‐19 disease when they are present.