What causes weakness and unsteadiness in the left arm and hand?
Stroke, local neurological problems
localized weakness can be caused by either a local neurological problem (like compression of a motor nerve for example when passing through narrowed interspinous spaces) or a central neurological problem (like stroke). The same applies for unsteadiness. If these symptoms occurred just now, you should visit a neurologist or the ER for immediate assessment. A CT-scan and MRI of the head would exclude most central causes (including stroke, tumors, hemorrhage, etc). MRI of the cervical spine may exclude nerve compression. A less likely cause is neuropathy.
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