What causes numbness in the limbs?
Disease description:
I have been feeling a numbness in my limbs lately, especially in my hands and feet. Sometimes it feels as if many tiny insects are crawling on me. This numbness can occur whether I am sitting or standing, and I have no idea what's causing it. Why does numbness in the limbs occur?
Doctor's answer (1)
Dr. Lv Zhiqin
Numbness in the limbs can be caused by various factors:
1. Nerve compression or injury: The most common cause is nerve compression or damage, such as cervical spondylosis or lumbar disc herniation. These conditions compress nerve roots, causing numbness in the corresponding areas. Additionally, diseases such as multiple sclerosis, diabetic neuropathy, and peripheral neuritis can also cause limb numbness.
2. Prolonged maintenance of the same posture: For example, sitting or lying down for extended periods may lead to temporary numbness due to impaired local blood circulation. Severe circulatory disorders, such as Raynaud's phenomenon or thrombosis, may also cause persistent limb numbness.
3. Metabolic diseases: For example, diabetes mellitus, in which high blood sugar levels can damage nerve fibers and cause limb numbness. Abnormal thyroid function and vitamin B12 deficiency are also associated with neurological dysfunction, which can lead to limb numbness.
4. Compression: Maintaining incorrect postures for long periods, such as prolonged sitting, standing, or improper sleeping positions, may result in limb compression and impaired blood circulation, leading to numbness.
5. Prolonged exposure to cold environments: Extended exposure to cold environments can slow the body's blood circulation, potentially impairing sensory nerves in the limbs and causing numbness.
6. Malnutrition: Long-term inadequate nutrient intake or excessive consumption may lead to deficiencies in proteins and vitamins necessary for proper bodily function, slowing nerve conduction and causing numbness.
