…stress can all deplete B vitamins from the body, so it is fairly easy to develop a deficiency of one or more of the B vitamins. Deficiency symptoms include fatigue, irritability, nervousness, low mood, insomnia, loss of appetite, sore or burning mouth or tongue, and cracks at the corners of the mouth. B vitamin deficiencies can also lower immune function and can cause anemia, constipation, neuritis, skin problems, acne, hair loss, early graying…