Numbness of the left hand can be seen in the following cases: first of all, it is considered that the nerve or local blood vessels are compressed, resulting in abnormal nerve sensation or ischemia, in which case the patient may have local skin pallor in addition to hand numbness, which can be relieved by hot compresses or massage. If the numbness of the left hand is accompanied by elevated blood pressure and dizziness, it may be caused by intracranial neuropathy and requires a cranial CT to further clarify the diagnosis; a stroke should also be ruled out, because stroke patients may also have numbness of the limbs, headache and dizziness; sometimes cervical spondylosis can also lead to numbness of the upper limbs, because cervical spondylosis can compress the nerves and thus cause numbness, but the limbs caused by cervical spondylosis Numbness can be accompanied by discomfort in the neck or shoulder, so the specific cause of numbness in the left hand needs to be diagnosed in the hospital.