Muscles are not only attributed to the movements of the body but also control the circulation of venous and lymph flows, body temperature, etc. Therefore, the failure of the muscles to function properly induces various kinds of symptoms.
Muscles constantly extend and contract within a normal range; however, when muscles over-extend and over contract, such as when lifting an excessive amount of weight, muscles cannot recover and become inflamed. When a muscle is inflamed, swollen or stiff due to fatigue, the space between the skin and muscle is compressed, resulting in constriction to the flow of lymphatic fluid. This compression also applies pressure to the pain receptors beneath the skin, which in turn communicates, “discomfort signals” to the brain; the person experiences PAIN. This type of pain is known as myalgia, or muscular pain.