Persistent Numbness and Tingling in the Left Leg

There is a tingling sensation like an electric shock in the left foot?

Hello, doctor.
I would like to ask you a question.
My left foot has been experiencing numbness, primarily in the sole, and sometimes I also feel soreness in the back of my thigh that radiates to the back of my knee.
I have undergone MRI and X-ray examinations, and the doctors said everything is fine.
I also visited a neurologist for nerve conduction studies, and they confirmed that there are no issues with my nerves.
However, I still experience a tingling sensation in my left leg, similar to an electric shock.
Occasionally, my lower back feels sore, and I have a painful point about five centimeters above the left groin.
If there are no nerve compression issues, why am I experiencing such numbness? It has been two months now.
Should I return to the neurologist for an electromyography (EMG) test? The rehabilitation physician has arranged for lumbar traction.
Will this harm my lumbar spine? Since both the MRI and X-ray results indicate no problems, I have taken pain relievers and muscle relaxants, but they haven't had much effect.
What could be wrong with me? I'm feeling quite distressed.
Thank you.

Ivy, 30~39 year old female. Ask Date: 2016/06/24

Dr. Li Weiqiang reply Rehabilitation

Dear Ivy,
Hello.
I am experiencing numbness in the soles of my feet, and sometimes I feel soreness in the back of my thighs extending to the area behind my knees.
However, the MRI did not reveal any significant findings, and the nerve conduction study conducted by the neurologist was normal.
I still experience a tingling sensation in my left leg, similar to an electric shock.
I have undergone lumbar traction, but it seems further evaluation and physical examination are necessary to provide a response.
Wishing you safety and health.
Sincerely,
Dr.
Wei-Chiang Li
Department of Rehabilitation Medicine
Taoyuan General Hospital, Ministry of Health and Welfare

Reply Date: 2016/06/24

More Info

Persistent numbness and tingling in the left leg can be a frustrating and concerning issue, especially when diagnostic tests such as MRI and X-rays return normal results. Given your description of symptoms, it is essential to consider several potential causes and treatment options.

Firstly, even if imaging studies show no structural abnormalities, it is still possible to experience nerve-related symptoms due to functional issues. Conditions such as lumbar radiculopathy, which occurs when a nerve root in the lower back is irritated or compressed, can lead to sensations of numbness or tingling. However, since your nerve conduction studies have indicated that there is no nerve compression, we should explore other possibilities.

One potential cause of your symptoms could be related to muscle tension or spasms in the lower back or hip area. Tight muscles can irritate nearby nerves, leading to sensations of tingling or numbness. The pain point you mentioned in the groin area could be indicative of a muscle strain or tightness in the hip flexors, which may contribute to your symptoms. Engaging in targeted stretching and strengthening exercises for the hip and lower back may help alleviate some of the discomfort.

Another consideration is the possibility of peripheral neuropathy, which can occur due to various factors, including metabolic conditions like diabetes, vitamin deficiencies (especially B vitamins), or even prolonged pressure on nerves from certain postures. If you have any risk factors for these conditions, it may be worth discussing them with your healthcare provider.

Regarding your question about returning to the neurologist for an electromyography (EMG) test, it could be beneficial if your symptoms persist. An EMG can provide more detailed information about the electrical activity of your muscles and help identify any subtle nerve issues that may not have been detected in previous tests.

As for the lumbar traction therapy that your rehabilitation physician has suggested, it is generally considered safe when performed by a trained professional. Lumbar traction aims to relieve pressure on the spinal discs and nerves, potentially providing relief from pain and discomfort. However, it is crucial to communicate any concerns you have about your spine's health with your healthcare provider before starting this treatment. They can help ensure that the therapy is appropriate for your specific situation and monitor your progress.

In the meantime, consider implementing lifestyle changes that may help alleviate your symptoms. Maintaining good posture, especially when sitting or standing for extended periods, can reduce strain on your back. Regular low-impact exercises, such as walking or swimming, can improve circulation and strengthen the muscles supporting your spine. Additionally, practicing relaxation techniques, such as yoga or meditation, may help reduce muscle tension and improve overall well-being.

In summary, while your imaging studies and nerve conduction tests have not revealed any significant issues, persistent numbness and tingling in your left leg warrant further investigation and management. Engaging in physical therapy, exploring potential underlying conditions, and considering additional diagnostic tests like an EMG may provide you with the answers and relief you seek. Always consult with your healthcare provider before making any changes to your treatment plan, and don't hesitate to express your concerns about your symptoms and their impact on your quality of life.

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