Researchers have used a smartphone app that helps people track their COVID symptoms. This app indicates six different COVID-19 symptom groups: (1) “Flu-like” with no fever— including headache, loss of smell, muscle pains, cough, sore throat, chest pain; (2) “Flu-like” with fever— including headache, loss of smell, cough, sore throat, hoarseness, fever, loss of appetite; (3) Gastrointestinal (stomach)— including headache, loss of smell, loss of appetite, diarrhea, sore throat, chest pain, no cough; (4) Severe Level I with fatigue— including headache, loss of smell, cough, fever, hoarseness, chest pain, fatigue; (5) Severe Level II with confusion— including headache, loss of smell, loss of appetite, cough, fever, hoarseness, sore throat, chest pain, fatigue, confusion, muscle pain; and (6) Severe Level III with abdominal and respiratory problems— including headache, loss of smell, loss of appetite, cough, fever, hoarseness, sore throat, chest pain, fatigue, confusion, muscle pain, shortness of breath, diarrhea, abdominal pain. Nearly half of the patients in group 6 were hospitalized (45%), compared with just 16% of those in group 1. People in group 4, 5, or 6 were usually older and frailer. These people were also more likely to be overweight and have pre-existing health conditions, like diabetes or lung disease, than those from groups 1, 2, or 3. The study has now identified a skin rash as a key symptom of COVID-19 in 1 in 10 cases. However, this was not recognized as a symptom at the time of this study, so it is not currently known how skin rashes fit into the six symptom groups.

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