The left side of the body pain with arm pain, mainly due to strain, craniosynostosis, cervical spondylosis, etc., it is recommended to promptly seek medical examination to clarify the specific causes, targeted treatment. 1, strain: recently engaged in heavy physical labor, resulting in local muscle strain, a large amount of lactic acid accumulation in the local, will lead to the left side of the body pain with arm pain, need to pay attention to rest protection, local hot compresses, massage, to promote the rapid absorption of lactic acid, so as to relieve the pain symptoms; 2, craniosynostosis: patients with brain hemorrhage, brain tumor, brain contusion, cerebral infarction and other diseases that may lead to hemiplegia. If the patient has brain hemorrhage, brain tumor, brain contusion, cerebral infarction and other diseases, which may cause damage to the central nervous system and lead to hemiplegia, it can be manifested as pain in the left side of the body with arm pain, which usually requires bed rest, and if it is caused by brain tumor, it is necessary to actively carry out brain tumor resection, and after surgery, it is necessary to apply nerve-nourishing drugs to If the brain tumor is caused by brain tumor resection, nerve nourishing drugs should be applied to promote nerve recovery, such as gangliosides, and with hyperbaric oxygen therapy, active or passive activities are needed to prevent joint stiffness and muscle atrophy; 3, cervical spondylosis: prolonged head-down work, trauma and ageing can lead to herniated disc degeneration, ligamentous hyperplasia and calcification, which can significantly compress the spinal nerve roots and lead to congestion and edema of the spinal nerve roots, resulting in left half of the Body pain and arm pain, even with numbness symptoms, need to avoid prolonged head-down work, local acupuncture, baking electricity, cupping, massage, traction and other treatment. In the acute stage, dehydrating agents can be applied to improve the edema of spinal nerves, such as mannitol, and oral medications can be taken to relieve pain symptoms, such as celecoxib. Pain in the left half of the body with pain in the arm requires attention to rest protection, avoiding continued exertion and reducing local stimulation, while for patients with more severe symptoms and longer duration, it is necessary to actively seek medical attention to clarify the diagnosis and carry out targeted treatment so as not to delay the condition.