Left arm muscle throbbing can be caused by muscle lesions, neuropathy, epilepsy, electrolyte disorders, etc. General treatment, physical therapy and drug therapy are feasible. 1. Muscle lesions: chronic strain of the left arm muscle, or muscle injury caused by trauma, can cause muscle throbbing. Seek medical advice to clarify the damage, pay attention to local rest and warmth, local hot compresses, massage and other treatments, oral ibuprofen and other drugs as prescribed by the doctor for analgesic treatment. 2. Neuropathy: peripheral neuropathy, nerve anterior horn cell lesions can cause muscle throbbing symptoms. The cause can be clarified by the doctor, oral methylcobalamin, vitamin B1 and other nutritive nerve drugs. 3. Epilepsy: Abnormal discharges of brain cells during epileptic seizures can cause muscle throbbing in the left arm. It is necessary to consult a doctor to clarify the epileptic condition, and apply phenobarbital, carbamazepine and other medications under the doctor’s guidance. 4. Electrolyte disorders: Electrolyte disorders caused by long-term malnutrition or diseases, such as low calcium, low sodium, low potassium, etc., can cause muscle throbbing. Need to consult a doctor for primary treatment, and blood tests to clarify the electrolyte indicators, targeted to be supplemental treatment. When the left arm muscle throbbing should be timely medical consultation, by specialists to clarify the cause of the disease after the appropriate treatment, will help early relief of discomfort symptoms.