3.Rhabdomyolysis
Endurance athletes, firefighters, people in the military, and older adults who can’t get up from a fall for an extended time are at the highest risk of getting rhabdomyolysis. This rare condition causes muscle soreness, weakness, and swelling because of muscle tissue breakdown. It can be life-threatening. Certain medications, illegal drugs, muscle injury, and severe dehydration or overheating can also cause it.
4.Flu
The achy, sore muscle feeling you get when flu sets in is a result of your immune system’s response to the virus, not the flu itself. Though the common cold and sinus troubles can also make you ache, the muscle soreness and pain you get during the flu tend to be more severe.
