What is the reason for numb feet after standing for a long time

Sometimes we often encounter some unexpected physical problems in our lives. In particular, feet numbness is likely to occur if you stand for a long time, and everyone's physical condition is completely different, so some special methods can be used to adjust the human body. Because some people often feel that their bodies are difficult to control, if a disease occurs, they should seek timely treatment. What is the reason for numbness in feet after standing for a long time?

What causes numbness in the feet?

1. Nerves cause numbness in the feet

The femoral nerve arises from the 2nd to 4th lumbar nerves and is the largest branch of the lumbar plexus. Among the cutaneous branches of the femoral nerve, there is the longest saphenous nerve, which is distributed below the patella, on the anterior medial side of the lower leg, to the medial edge of the foot.

The obturator nerve comes from the L2-4 nerves. Its endings are cutaneous branches, which are distributed in the skin on the inner side of the thigh, sometimes passing the knee to the inner side of the calf.

The sciatic nerve comes from the L4 and L5 nerve roots and the S1-3 nerve roots. Before the popliteal fossa, the sciatic nerve is divided into the tibial nerve and the common peroneal nerve, which innervate all the muscles of the calf and foot, as well as the skin sensation of the calf and foot except the area innervated by the saphenous nerve.

2. Lumbar dislocation causes foot numbness

When the lumbar spine becomes unstable, dislocated or the pelvis is misaligned, the lumbar sacral nerves are stimulated or compressed, causing the muscles they control to contract and spasm, or the skin they control to feel sore and uncomfortable symptoms.

3. Autoimmunity causes numbness in the feet

It has been found that 60% of AS patients have elevated serum complement, most cases have IgA-type rheumatoid factor, serum C4 and IgA levels are significantly increased, and there are circulating immune complexes (CIC) in the serum, but the antigenic nature has not been determined. The above phenomena suggest that immune mechanisms are involved in the pathogenesis of this disease.

4. Other reasons for foot numbness

Trauma, endocrine, metabolic disorders and allergic reactions are also suspected to be the pathogenic factors.

Possible reasons for numb feet: poor blood circulation. People with generally good physical conditions generally do not have numbness in their feet. If numbness in your legs and feet occurs after sitting for a long time or for other reasons, dip your finger in a little saliva and apply it on the tip of your nose. After about a minute, the numbness will disappear. Don't always take the same posture, or you will feel numb after a long time. Get up and move around after a while. If you feel numb, move around, rub, or tap your body. This will provide relief. Eat more foods containing iron.

What does frequent numbness in the feet indicate?

1. Vascular factors

Bad sitting posture can also cause numbness in the feet, and the hands can also become numb if they are placed in the wrong position. Once you relax, it feels like millions of ants are crawling, because when the blood vessels are compressed, the blood supply to the limb part is ischemic, causing numbness. Once the compression is relieved and the blood flows through, it feels like many ants are crawling. When the ulnar artery and radial artery of the upper limb are compressed at a certain point, it will cause numbness in the hand.

Poor sitting posture can also cause numbness in the feet

2. Neurological factors

There is axoplasm flowing in the nerves. When the nerves are compressed, the axoplasm flow is obstructed, which can also cause numbness in the hands. The main nerves to the palm are the radial nerve, ulnar nerve, and median nerve. These nerves start from the cervical vertebral canal, pass through joints, ligaments, and bone fiber tubes to reach the end of the palm. If the nerves are compressed in any part, it will cause numbness in the hand.

3. Stroke: numbness on one side and normal on the other side

For people with diseases such as high blood pressure, high blood lipids, and arteriosclerosis, numbness in the hands and feet mostly manifests as weakness and numbness on one or both sides of the limbs. It usually does not occur only in the feet, and the cause is sudden and urgent. If asked carefully, the patient will often have transient blackouts, aphasia, hearing changes, slurred speech, etc. Medically called a "mini-stroke," it often occurs before a sudden stroke. People with cardiovascular and cerebrovascular diseases such as hypertension must be vigilant.

4. Lumbar disc herniation: general anesthesia of the waist, legs and feet

Lumbar disc herniation refers to compression of the sciatic nerve, which controls the lower limbs. Its pathway runs along the waist, buttocks, back of thigh, posterior and lateral side of calf to the outside of the foot. Therefore, patients with lumbar disc herniation are prone to foot numbness, and most of them are also accompanied by back pain, leg pain, etc.

Some patients experience numbness in the left foot sometimes and in the right foot sometimes. Most of these people suffer from central lumbar disc herniation.

5. Complications of diabetes: numbness of lower limbs, tingling, and fever

When blood sugar rises, it will cause a series of metabolic disorders in nerve fibers, leading to peripheral neuropathy, numbness, tingling, fever, electric shock-like numbness and pain in the extremities, which may spread from the distal toes to above the knees, and there will be abnormal sensations like wearing socks and gloves.

Generally speaking, the lower limbs are more serious than the upper limbs. If the patient already knows that he has diabetes, the primary disease should be actively treated. If there is a family history of diabetes or if you are obese, the possibility of diabetes should also be considered.

6. Tumor: pain never stops

If elderly people experience long-term chronic numbness in their hands and feet, it should be considered that it is caused by malignant tumors. In the late stage of the tumor, due to the influence of the remote site effect, corresponding neurological symptoms will occur, such as numbness of hands and feet, unsteady walking, etc. Women need to have their ovaries and breasts checked.