does b12 injections cause headaches Headache After Shot: Why It Happens & What to Do Too Much Vitamin B12: Risks,

One type of mutation, found almost exclusively in people of Ashkenazi Jewish heritage, affects the autonomic and sensory nervous system development causing familial dysautonomia (FD ) Another mutation causes an increased level of phenylalanine (Phe) in the bloodstream resulting in a metabolic disorder called phenylketonuria (PKU)

However, paresthesias is also a common symptom of nerve damage caused by high blood sugar in people with diabetes this is called diabetic peripheral neuropathy

Diabetes Care 22:623634

Also, children and adolescents with obesity are more than four times as likely to have low B12 levels as those at a healthy body weight