Feeling dizzy or wobbly can be signs of a vitamin B12 deficiency. Some people can become dizzy simply by standing up or walking up a short flight of steps. These symptoms can prove to be quite dangerous. They can cause severe falls that may themselves cause even more serious injuries. In a recent study, emergency room patients had their B12 levels tested. They were compared to the B12 levels of volunteers who showed no signs of dizziness or vertigo. The patients seeking medical help had levels of B12 that were up to 40 percent lower than those of the volunteers. Decreasing levels of vitamin B12 can cause serious symptoms and require further testing.