Racing Heart Rate
Another common symptom of vitamin B12 deficiency is a racing heart rate, which is often accompanied by shortness of breath. Your heart might need to beat more quickly to compensate for the loss of red blood cells in your body. This condition is also known as anemia. It puts higher pressure on your heart to push more blood to other parts of the body. This is a response of the body to ensure there are enough oxygen and nutrients going around the body.[3]
