Left-Sided Numbness: Possible Neurological Causes

Left-sided partial numbness?

Hello, I have a situation that may seem strange, but I couldn't find similar reasons no matter how much I searched, so I'm reaching out to you.
It started with an itch in a single tooth, and I initially thought it was a gum issue.
However, the next day, I began to experience numbness in my left lower lip, which gradually extended to my left hand, starting from the fingertips.
Now, I also have numbness in my left ear, scalp, chin (the rest of my face feels normal), and my neck extending to the upper left back, including the previously numb left lower lip and left arm.
I find this very frightening and uncomfortable, although I have no issues with function; my face and hands are not weak.
Based on my symptoms, I have ruled out common causes such as carpal tunnel syndrome and minor strokes, but I am even more confused.
I hope you can provide me with some advice.
Thank you.

Liu, 20~29 year old female. Ask Date: 2023/03/23

Dr. Wu Mukhan reply Neurology

Hello, it seems that you are experiencing sensory abnormalities on the left side of your face as well as on the left side of your body.
This situation requires ruling out any issues related to the brain, as stroke or central nervous system lesions cannot be completely excluded.
If your symptoms do not improve, it is advisable to visit a hospital's neurology department for further examination as soon as possible to prevent any potential worsening of your condition.
Wishing you a speedy recovery!

Reply Date: 2023/03/23

More Info

Your symptoms of left-sided numbness and tingling, particularly affecting your lower lip, left hand, and extending to your neck and upper back, are indeed concerning and warrant further investigation. While it is good that you have ruled out common causes like carpal tunnel syndrome and transient ischemic attacks (mini-strokes), the combination of symptoms you describe suggests that there may be a neurological issue at play.

One possible explanation for your symptoms could be related to nerve compression or irritation. This can occur due to various reasons, including poor posture, repetitive strain, or even a herniated disc in the cervical spine that may be affecting the nerves that innervate the left side of your body. Given that you mentioned the numbness started after experiencing itchiness in a single tooth, it is also worth considering whether there could be a connection to dental issues, such as an infection or inflammation that might be affecting the nearby nerves.

Another potential cause could be related to a condition known as multiple sclerosis (MS), which can present with unilateral symptoms like numbness and tingling. However, MS typically includes other symptoms such as fatigue, vision problems, or motor weakness. It is important to note that while MS is a possibility, it is less common and would require further diagnostic testing, including MRI scans and possibly lumbar puncture, to confirm.

Additionally, your symptoms could be indicative of a vascular issue, such as a transient ischemic attack (TIA) or even a stroke, especially if there are risk factors present like hypertension, diabetes, or a family history of vascular diseases. Although you mentioned that you do not have weakness in your face or limbs, it is crucial to monitor for any sudden changes in your condition, as these can be indicative of a more serious underlying issue.

Given the complexity of your symptoms and the potential for serious underlying conditions, it is highly advisable to seek a comprehensive evaluation from a neurologist. They may recommend imaging studies, such as an MRI of the brain and cervical spine, as well as nerve conduction studies to assess the function of the nerves in your arms and face. These tests can help identify any structural abnormalities, nerve damage, or other neurological conditions that may be contributing to your symptoms.

In the meantime, you can take some steps to alleviate discomfort. Maintaining good posture, especially if you spend long hours sitting or using a computer, can help reduce nerve compression. Regular breaks to stretch and move around can also be beneficial. If you notice any worsening of your symptoms or the development of new symptoms, such as weakness, difficulty speaking, or changes in vision, seek immediate medical attention.

In summary, while your symptoms may seem puzzling, they could be indicative of a range of neurological issues, from nerve compression to more serious conditions. A thorough evaluation by a healthcare professional is essential for accurate diagnosis and appropriate management. Please prioritize seeking medical attention to ensure your health and well-being.

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