Myasthenia Gravis
Myasthenia gravis (severe muscle weakness) is characterised by muscular fatigue in the wake of very little exercise. It may be apparent after a short period of exercise or work, toward the end of a long conversation, or sometimes even after a few repetitions of a movement. Rest brings a feeling of recovery. The rapid onset of weakness after exercise distinguishes myasthenia gravis from other disorders such as depression or general fatigue. There are no visible signs of muscle pathology