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Cerebral white matter T2 signal changes are very common findings over 50, especially in those with hypertension or other risk factors for small vessel pathology such as high cholesterol, smoking, diabetes, vasculitis, etc. There are rarely discernible clincal features from these changes, though dizziness is possible if the # ***** lesions is great or there are lesions in key areas of the brain associated with balance.
Intermittent hand numbness and cramping are more commonly seen in other conditions, such as repetitive strain injuries, carpal tunnel syndrome, cervical radiculopathies, etc.
Intermittent dizziness and nausea are also more commonly seen in other conditions such as disorders of the inner ear or dysautonomias in which one's blood pressure may drop rapidly and without warning, particularly upon standing up or changing positions. Certain medications, especially those used for hypertension may make this more likely to occur, so this would be important to discuss with your doctor.
Disorders of the inner ear are best worked up by otolaryngologists (ENTs) and dysautonomias by neurologists.