According to the World Health Organisation, “the most common signs of infection are fever, tiredness and dry cough”. Other symptoms, including aches and pains, runny nose, blocked nose, sore throat and occasionally diarrhoea may be present also. Most of the time symptoms are mild and begin gradually. Some people can become infected without feeling unwell and around 80% recover from the infection without needing special treatment.
Some people who get infected develop serious illness which means difficulty in breathing. People with difficulty breathing, fever and cough should seek medical care quickly.
Here is a chart which might help you understand the difference between the common cold, the flu and Coronavirus (Covid-19):