Headache After B12 Shot: 3 Effective Strategies to Feel Better Always Tired? B12 Injections Could Help B12 Injections Vitamin B12 Injections: What You Need To Know The Weird Connection Between B12 Deficiency & Migraine Headaches Vitamin B12 deficiency can cause symptoms like headaches, fatigue, depressive mood, gastrointestinal issues, and more. While vegetarians are at a higher risk of vitamin B12 deficiency, it can affect non vegetarians too. Check