If the numbness of the left arm exists in the acute stage of cerebral infarction, it is normal to continue the numbness of the left arm in the recovery stage of cerebral infarction. If the numbness of the left arm is a new symptom, then we need to be alert to the possibility of new cerebral infarction. If the numbness of the left arm exists in the acute stage of cerebral infarction, and the numbness of the left arm continues in the recovery stage of cerebral infarction, it belongs to the common phenomenon, which is caused by the blockage of cerebral blood vessels and the poor local blood circulation, and it takes a certain period of time to recover. For the numbness of the left arm, you can use nerve-nourishing drugs under the guidance of doctors, such as methylcobalamin, vitamin B12 and so on. If the numbness of the left arm is a new symptom, you need to be alert to the possibility of new cerebral infarction, you need to go to the Neurology Department of the hospital, review the brain MR whether there is a new infarction, and under the guidance of the doctor to treat the symptom in a timely manner. Arm numbness during the recovery period of cerebral infarction needs to consult a doctor in a timely manner to clarify the cause of the problem and then deal with it. Drugs need to be used under the guidance of a doctor.