What causes numbness in the left hand and foot?

Numbness in the left hand and foot may be caused by conditions such as peripheral neuropathy, cerebrovascular disease, and central nervous system disorders.

1. Peripheral Neuropathy

When patients have improper diets—such as long-term alcohol consumption, excessive intake of high-sugar foods leading to diabetes, or deficiencies in nutrients like vitamin B2 and folic acid—peripheral nerves may become damaged. Additionally, certain medications can also cause peripheral nerve lesions. These factors may lead to numbness in the left hand and foot, which is typically symmetrical.

2. Cerebrovascular Disease

Cerebrovascular diseases, especially acute ones, may also cause the aforementioned symptoms. These are often accompanied by adverse effects such as dizziness, headache, slurred speech, and difficulty swallowing.

3. Central Nervous System Disorders

Long-term activities involving frequent neck bending or heavy physical labor may lead to central nervous system conditions such as cervical spondylosis or lumbar disc herniation. These conditions may compress nerves on both sides of the body and consequently result in numbness in the left hand and foot.