Muscle fatigue

Muscle fatigue occurs in case of exhaustion, after physical activity, or strenuous work. But also during a fever or a viral ailment. In more serious cases, it is an ailment at the level of the muscle, but also of the nerves. Muscle weakness is a condition where a person is unable to perform routine operations, whether upper or lower extremities, and when the muscles are locally or globally prematurely tired and flaccid throughout the body. In some cases, such weakness may be a sign of exhaustion after strenuous physical activity or sporting activity. However, unless there is an external cause or reason for such fatigue, muscle weakness can be a symptom of many of the various ailments, not only the musculoskeletal system ailments. Possible relation to pain in the shoulder and back muscles is the inability to go out of the way or retreat, to move sideways.