Feeling Lightheaded
Because vitamin B12 helps make healthy red blood cells, deficiency can lead to anemia. Anemia may make a person look pale or feel lightheaded, dizzy, weak, or short of breath.
Some people also notice a fast heartbeat or feel unusually tired during mild activity. These symptoms can also come from low iron, heart problems, dehydration, thyroid disease, or other causes, so blood testing is important.
If you feel faint, short of breath, or unusually weak, do not assume it is just aging or stress.
3. Tingling, Pins and
