The common causes of arm numbness in the elderly include cerebrovascular disease, hyperlipidemia, cervical spondylosis, etc. The reasons are as follows: 1. The elderly are prone to high blood lipid metabolism as they age, and significantly elevated blood lipids can lead to slow blood flow, affecting the local tissue blood supply and oxygenation and arm numbness. If you want to sleep at night, try not to pillow high pillows can perform cervical spine film to understand the situation, if necessary, you can symptomatic physical therapy.