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Cyanocobalamin injection: Medlineplus Drug Information

12, 3431-3438, DOI: 10.1519/JSC.0000000000002176

This background pain may appear in up to 24%49% of patients, and may be described as burning, stinging, or pulsatile.22,23 The most recent data do not fully support the theory that continuous pain is the result of longstanding paroxysmal TN.23 While the underlying pathophysiological mechanism is not fully understood, it is believed to involve central sensitisation and damage to C fibres of the nerve root

So if you're on a vegan or vegetarian diet where you're not eating foods from animals, you're at risk for B12 deficiency

For those with chronic absorption issues like pernicious anemia , lifelong injections every 2 to 3 months are common