Why Do My Feet Go Numb When Sitting or Squatting? - Neurology

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Experiencing numbness in your feet while sitting, squatting, or in various positions can be concerning, especially if it has persisted for several years. This phenomenon is often related to nerve compression or restricted blood flow, and understanding the underlying causes is essential for addressing the issue effectively.

When you sit in certain positions, such as crossing your legs (翹二郎腿) or squatting, you may inadvertently compress nerves or blood vessels in your legs. The most common nerve affected is the peroneal nerve, which runs along the outside of the knee and can become compressed when the leg is crossed or bent for extended periods. This compression can lead to a sensation of numbness or tingling, often described as "pins and needles."
In addition to nerve compression, prolonged pressure on the blood vessels can restrict blood flow to the feet, leading to similar sensations. When you change positions, such as uncrossing your legs or standing up, blood flow typically returns, and the numbness subsides. However, if you find that your feet go numb frequently and in various positions, it may indicate a more chronic issue.

Several factors could contribute to your symptoms:
1. Posture and Ergonomics: Poor posture while sitting or squatting can lead to nerve compression. Ensure that your seating position is ergonomic, with your feet flat on the ground and your knees at a right angle.

2. Nerve Entrapment Syndromes: Conditions such as tarsal tunnel syndrome (compression of the tibial nerve in the ankle) or peroneal nerve entrapment can cause numbness in the feet. These conditions may require further evaluation by a healthcare professional.

3. Circulatory Issues: Conditions affecting blood circulation, such as peripheral artery disease, can lead to numbness and tingling in the extremities. If you experience additional symptoms like pain or cramping, it’s essential to consult a doctor.

4. Diabetes: Diabetes can lead to peripheral neuropathy, a condition that affects the nerves in the feet and can cause numbness, tingling, or pain. If you have a family history of diabetes or other risk factors, it may be worth getting screened.

5. Vitamin Deficiencies: Deficiencies in vitamins such as B12, B1, or B6 can lead to nerve damage and symptoms of numbness. A balanced diet or supplementation may be necessary if a deficiency is identified.

6. Underlying Medical Conditions: Conditions such as multiple sclerosis, fibromyalgia, or other neurological disorders can also present with symptoms of numbness and tingling. If your symptoms are persistent and worsening, it’s crucial to seek a thorough evaluation.

Given that your symptoms have persisted for 6 to 7 years, it would be advisable to consult a healthcare professional, such as a neurologist or orthopedic specialist. They may recommend diagnostic tests, such as nerve conduction studies or imaging, to determine the exact cause of your symptoms.
In the meantime, consider making some lifestyle adjustments. Regular stretching, maintaining good posture, and avoiding prolonged positions that may compress nerves can help alleviate symptoms. Additionally, if you notice that certain activities exacerbate your numbness, try to modify those activities or take breaks to relieve pressure on your legs.

In summary, while occasional numbness in the feet can be a common experience, especially with certain positions, persistent symptoms warrant further investigation. A healthcare professional can help identify the underlying cause and recommend appropriate treatment or lifestyle modifications to improve your condition.