Hi doctors. how do i know if i have a cold or something more serious?

Cold vs Flu: According to Mayo Clinic Flu sxs may include “Fever over 100F (38C), Aching muscles, especially in your back, arms and legs, Chills & sweats, Headache, Dry Cough, Fatigue and weakness, Nasal Congestion.” ** Common cold symptoms in adults often include sore throat, cough, sneezing, runny or stuffed nose, slight headache, mild fever, mild aches & pains.