Mohanlal unwell: What is 'Myalgia' on his medical certificate?

Malayalam actor Mohanlal is unwell and the actor has been admitted to a renowned Kerala hospital in Kochi. He was reportedly shooting for the sequel of the Prithviraj directorial Lucifer, titled Empuraan, alongside his directorial debut Barroz. The hospital authorities said that the 64-year-old actor has a high-grade fever, breathing difficulty and 'generalised myalgia.' They have also mentioned that a viral respiratory infection is suspected and he has been asked to avoid crowded places and five days of rest. The actor's fans are wondering what myalgia, which is mentioned on his medical certificate, is all about. And how serious is it?

What causes Myalgia?
Myalgia simply refers to aches and pain in the muscles, ligaments and tendons. According to Johns Hopkins University, a range of reasons can cause the condition, including overuse, trauma, tension, certain illnesses and their drugs, and even injuries. The actor having generalised myalgia can mean that he is experiencing discomfort throughout his body. Quite a few approaches are taken to alleviate these symptoms and cure the body, including rest and recovery, hydration and nutrition, pain relief, physical therapy, heat or cold therapy, massage, ergonomics, stress management and lifestyle modifications.