Muscle aches are also known as muscle pain, myalgia, or simply pain in the muscles. Muscle aches are extremely common. Almost everybody has likely experienced discomfort in his or her muscles at some point.
Because almost every part of the body has muscle tissue, this type of pain can be felt practically anywhere. According to the Mayo Clinic, it usually affects a small number of muscles at a time, although myalgia throughout the body is possible (Mayo Clinic, 2010).