Left Tongue Numbness and Loss of Taste: Neurological Issues - Neurology

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Left tongue numbness and loss of taste can be concerning symptoms that may indicate underlying neurological issues. The fact that you experienced facial nerve dysfunction (often referred to as Bell's palsy) suggests that there may have been an acute event affecting the nerves in that area. The facial nerve (cranial nerve VII) is responsible for controlling the muscles of facial expression and also carries taste sensations from the anterior two-thirds of the tongue.
When you mention that your left tongue feels numb and that you have lost taste sensation, it is important to consider a few potential causes. One possibility is that the facial nerve was affected during your initial episode, leading to altered sensations in the tongue. This can happen if the nerve is inflamed or compressed, which can occur in conditions like Bell's palsy or even due to viral infections.
Another consideration is the involvement of the glossopharyngeal nerve (cranial nerve IX), which is responsible for taste sensation from the posterior one-third of the tongue and also plays a role in swallowing. If this nerve is affected, it could lead to symptoms such as numbness and loss of taste.
Vitamin B deficiency, particularly B12, can also lead to neurological symptoms, including numbness and tingling in various parts of the body, including the tongue. While your doctor has prescribed vitamin B, it may be worth discussing with them whether further testing is needed to rule out deficiencies or other neurological conditions.
In some cases, persistent numbness and loss of taste can be attributed to neuropathy, which can occur due to various factors, including diabetes, autoimmune diseases, or even exposure to toxins. It is essential to monitor your symptoms closely and report any changes to your healthcare provider.

If your symptoms persist or worsen, it may be beneficial to seek a referral to a neurologist for a more comprehensive evaluation. They may recommend additional tests, such as imaging studies (like MRI) or nerve conduction studies, to assess the function of the affected nerves and determine the underlying cause of your symptoms.

In summary, while it is understandable to feel anxious about your symptoms, there are several potential explanations for left tongue numbness and loss of taste. It is crucial to maintain open communication with your healthcare provider, follow their recommendations, and seek further evaluation if necessary. With appropriate management and treatment, many neurological symptoms can improve over time.