Frequent muscle throbbing in the left arm should be ruled out if there has been any upper limb strength exercises recently. After performing upper limb strength exercises, most muscle throbbing originates from muscle fatigue and muscle nerve self-regulation, and muscle throbbing occurs when motor neurons still issue nerve impulses after exercise. It can also be caused by regular consumption of coffee and strong tea that lead to neuronal excitement, and frequent anxious patients who are often emotionally tense can also lead to long-term muscle tension, which can also trigger muscle jumping. It can also be seen in the long-term application of certain drugs, such as glucocorticoids, diuretics, estrogen, which can also trigger muscle jumping. Unilateral limb jumping without muscle strength loss, muscle atrophy, and asymmetry can mostly exclude motor neuron related lesions.