You would like to know what could be the cause of the pain in the left side of your head as well as the reason for the numbness of your left arm.
Pain on one side of the head can appear in the following situations: migraines, CVI (cerebrovascular insult- bleeding in the brain), atherosclerosis of the arteries that supply the brain with blood, etc. Numbness in one arm may be caused if the nerves including the part of the brain that control the arm are affected from infection or infarction.
According to the data that you described, it is likely that you may be experiencing any of the medical conditions listed above. You may consider seeing a neurologist to rule out migraines, CVI or atherosclerosis. You may also consider consulting a neurovascular surgeon for treatment options if diagnosed with atherosclerosis of the arteries that supply the brain with blood.
Please keep in mind that I am trying to provide you with medical information here. I am not able to give you medical advice online. Please contact your doctor or a qualified healthcare provider such as a neurologist and neurovascular surgeon for further advice, diagnosis and treatment option.
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