Chills, headaches and loss of appetite should be added to Covid symptoms list, say scientists Imperial College study of more than one million people finds 60 per cent diagnosed with virus not experiencing 'classic' signs 10 February 2021 • 3:15pm People in England are encouraged to take a Covid test if they have at least one of four 'classic' symptoms of the virus Credit: Jacob King/PA Loss of appetite, chills, headaches and muscle aches should be added to the list of coronavirus symptoms to look out for, with scientists saying infected people are suffering a wider range of complaints. A study of more than one million people by Imperial College found that 60 per cent diagnosed with Covid are not experiencing the four "classic" symptoms – loss of smell and taste, fever and a new persistent cough.