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Headache After B12 Shot: Why It Happens & What to Do The Weird Connection Between B12 Deficiency & Migraine Headaches I've had a migraine since Sept 4th. I took a B12 injection that day (prescribed by my doctor) so I'm wondering if it's related or coincidence. I'm scared to take another one Why Do I Feel Worse After My B12 Injection? Causes & Management Bolt Pharmacy
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