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Examples of causes of secondary tinnitus include 12 : Vascular conditions that generate an internal perceivable sound Musculoskeletal causes, such as head or neck injury or temporomandibular joint dysfunction Use of ototoxic medications Bacterial, viral, or fungal infections Trauma to the auditory structure, such as the ear drum Earwax impaction or improper earwax cleaning procedures 77,78 Metabolic disturbance, such as diabetes or imbalanced lipid levels Neurological conditions, such as intracranial hypertension or vestibular migraine Other problems affecting the outer and middle ear, such as cerumen impaction, tumors, fusing of the middle ear bones, or dysfunction of the tympanic membrane or eustachian tubes Medications that Can Cause Tinnitus Many medications are known to have toxic effects on auditory tissues and can cause or worsen tinnitus (Table 2), especially when used long-term and/or at high doses

These arent tiny tweaks theyre potentially huge improvements that could make your current dose work better or let you get the same results with less B12
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The best way to prevent feeling worse after a B12 injection is by starting with small doses and gradually increasing them over time
1 1 Although each of the neurotropic B vitamins has its own special role in nerve health, they all work together in synergy to repair, regenerate and protect the nerve fibers that make up your nervous system