Trigeminal Neuralgia: This condition is characterized by sudden, severe, and stabbing pain or numbness in parts of the face, which can also affect taste due to the involvement of the trigeminal nerve. The absence of vision problems aligns with this diagnosis since the trigeminal nerve does not control vision.

Multiple Sclerosis (MS): MS can cause numbness in the face due to lesions in the central nervous system, including areas responsible for facial sensation. Taste can also be affected if the lesions involve the pathways related to taste perception.
Stroke or Transient Ischemic Attack (TIA): A stroke or TIA in specific areas of the brain, such as the brainstem or the areas supplied by the middle cerebral artery, can cause facial numbness and potentially affect taste. However, vision is usually not affected if the lesion is strictly limited to areas controlling facial sensation.
Lyme Disease: Neurological manifestations of Lyme disease can include facial numbness or paresthesia, and while less common, it could potentially affect taste if the infection involves the cranial nerves.

Brain Tumor: A tumor in the brain, particularly in the brainstem, cerebellopontine angle, or the areas adjacent to the trigeminal nerve, can cause facial numbness and taste disturbances. Although less common, missing this diagnosis could have severe consequences.
Cavernous Sinus Thrombosis: This is a rare but potentially life-threatening condition that can cause facial numbness among other symptoms due to the involvement of cranial nerves. It requires immediate medical attention.
Sjögren's Syndrome: An autoimmune disorder that can affect the nerves, including those responsible for taste and facial sensation, though it's more commonly associated with dry eyes and mouth.

Sarcoidosis: A condition that can affect any part of the body, including the nervous system, leading to facial numbness and potentially taste problems if the cranial nerves are involved.
Guillain-Barré Syndrome: An autoimmune disorder that can lead to rapid-onset muscle weakness and, in some cases, facial numbness and taste disturbances, though it typically presents with more widespread neurological symptoms.
Vitamin Deficiencies (e.g., Vitamin B12): Certain vitamin deficiencies can cause neurological symptoms, including numbness and tingling in the face, though taste disturbances are less commonly highlighted in the literature.