What does "myalgia" mean and how does it differ from "myopathy"?

Myalgia means muscle pain, from myo meaning muscle and algia meaning pain. It is a symptom that can result from overuse, injury, infection, medication side effects such as statins, or systemic conditions like fibromyalgia. Myopathy means muscle disease, from myo meaning muscle and pathy meaning disease. Myopathy refers to a group of disorders where muscle fibers do not function properly, causing weakness rather than just pain. Myopathies can be inherited like muscular dystrophy or acquired like inflammatory myopathies.