Persistent Numbness in Hands and Feet: Possible Causes

Numbness in the hands and feet?

To the doctor: I have been experiencing numbness in my hands and feet for over a year now, and it comes and goes.
My sleep, eating, and daily activities are normal, and I don't have significant life stress.
The numbness feels very unreal; sometimes when I hold a small baby, the areas of contact with the baby also feel numb.
Most of the time, the numbness is limited to my hands and feet, and it occurs even when I'm not holding the baby.
What could be the possible causes of this? I previously underwent nerve conduction studies, and the results were normal.
What other factors could contribute to this condition? Additionally, why does the area of contact with the baby cause numbness? Thank you.

nico, 20~29 year old female. Ask Date: 2005/04/05

Dr. Lai Lunxiang reply Neurology

Hello! The sensations of "tingling" or other similar symptoms can have many causes.
A detailed explanation could fill a book, so it's better to visit a clinic for an examination, which will allow for quicker management.
Thank you!

Reply Date: 2005/04/05

More Info

Persistent numbness in the hands and feet can be a perplexing and concerning symptom, especially when it has been ongoing for over a year. There are several potential causes for this sensation, and understanding them can help guide you toward appropriate management and treatment.

1. Peripheral Neuropathy: This is one of the most common causes of numbness and tingling in the extremities. It can result from various factors, including diabetes, vitamin deficiencies (particularly B vitamins), alcohol use, and certain medications. Even if previous nerve conduction studies showed normal results, peripheral neuropathy can sometimes be subtle or develop over time.

2. Nerve Compression: Conditions such as carpal tunnel syndrome or thoracic outlet syndrome can lead to numbness in the hands. These occur when nerves are compressed due to repetitive motions, poor posture, or anatomical variations. If you frequently use your hands for activities like typing or holding a baby, this could contribute to nerve compression.

3. Circulatory Issues: Reduced blood flow to the extremities can also cause numbness. Conditions like Raynaud's phenomenon or peripheral artery disease can lead to symptoms of numbness and tingling, especially in response to cold temperatures or stress.

4. Multiple Sclerosis (MS): While less common, MS can present with numbness and tingling as one of its early symptoms. It is a demyelinating disease that affects the central nervous system. If you have other neurological symptoms, this may warrant further investigation.

5. Anxiety and Stress: Psychological factors can also manifest physically. Anxiety can lead to hyperventilation, which may cause temporary numbness and tingling in the extremities. Additionally, chronic stress can lead to muscle tension, which may contribute to nerve compression.

6. Postural Factors: If you are holding a position for a long time, such as cradling a baby, this can lead to temporary numbness due to pressure on nerves or blood vessels. It's essential to change positions regularly and ensure that you are not putting undue pressure on your arms or legs.

7. Vitamin Deficiencies: Deficiencies in certain vitamins, particularly B12, can lead to neurological symptoms, including numbness and tingling. A blood test can help determine if you have any deficiencies that need to be addressed.

8. Thyroid Issues: Hypothyroidism can lead to peripheral neuropathy and may cause numbness in the hands and feet. A simple blood test can check your thyroid hormone levels.

Given that your symptoms have persisted for over a year, it is crucial to follow up with a healthcare provider. They may recommend additional tests, such as blood tests to check for vitamin deficiencies, thyroid function, or autoimmune markers, and possibly imaging studies to rule out structural issues.
In the meantime, consider keeping a symptom diary to track when the numbness occurs, its duration, and any associated activities or positions. This information can be invaluable for your healthcare provider in diagnosing the underlying cause.

Lastly, if you experience any sudden changes in your symptoms, such as increased severity, weakness, or loss of coordination, seek medical attention promptly, as these could indicate a more serious condition.

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