What causes constant left arm pain?

Brief Answer: I will advise you to MRI. Detailed Answer: Hello, I have studied your case . Due to compression of nerve root in cervical spine there can be pain in your arm. I will advise you to MRI cervical spine for better diagnosis. Another possibility of vascular obstruction to arm, for this clinical examination may be required. For these symptoms analgesic and neurotropic medication can be started. Till time, avoid lifting weights. You can consult physiotherapist for help. Physiotherapy like ultrasound and interferential therapy will give quick relief. I will advise to check your vit B12 and vit D3 level. Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries. Wishing you good health. Take care.