Certified Neuroscience Registered Nurse (CNRN) Practice Exam

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What neurological symptom can occur with vitamin B12 deficiency?

Memory loss
Insomnia
Severe headaches
Tremors

The correct answer is: Memory loss

Vitamin B12 deficiency is associated with various neurological symptoms, and memory loss is one of the most prominent manifestations. The deficiency can lead to neurological changes due to its crucial role in maintaining the health of nerve cells and supporting the production of myelin, the protective sheath that surrounds nerves. When B12 levels are low, it can disrupt normal neurological function, leading to cognitive impairments, including issues with memory, concentration, and overall cognitive decline. This is particularly evident in cases where the deficiency is prolonged and untreated. The other symptoms like insomnia, severe headaches, and tremors, while they can occur for various reasons, are not characteristic or specific indicators of vitamin B12 deficiency in the same way that memory loss is. Therefore, memory loss serves as a key indicator of potential neurological involvement due to a lack of vitamin B12.