Should you contract it, though, it's nasty. Your hands and feet will get numb and you'll feel a burning sensation. You'll be restless and irritable, yet also fatigued. Your GI system will have "disturbances," as the NIH put it, which could mean anything from cramping to vomiting. Some texts even list apathy as a symptom, likely as a result of your extremely low energy production. Like the other B vitamins (it's also known as vitamin B5), pantothenic acid is involved in the chemical cycle that produces energy inside your cells, so a deficiency hurts all kinds of bodily functioning.