Symptoms of untreated vitamin B-12 deficiency may include weakness, lightheadedness, tiredness, stomach upset, diarrhea and constipation. Additional symptoms may include easy bruising or bleeding, weight loss, pale skin,... More » Health Pain & Symptoms

According to The University of Maryland Medical Center, symptoms of vitamin B12 deficiency include tiredness, respiratory limitations, diarrhea, anxiety and tingling in the extremities. These symptoms arise from this par... More » Health Medications & Vitamins Vitamins & Supplements

According to Harvard Medical School, a vitamin B12 deficiency can occur if a person is either not consuming enough vitamin B12 or her body cannot properly absorb the nutrient. A vitamin B12 deficiency can range from mild... More » Health Medical Ranges & Levels
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Some signs of vitamin B-12 deficiency include tiredness, lightheadedness, weakness and rapid breathing or fast heartbeat, notes WebMD. Constipation, diarrhea, upset stomach, weight loss and sore tongue are additional sym... More » Health Medications & Vitamins Side Effects

Symptoms of vitamin B-12 deficiency include weakness, lightheadedness, pallor, digestive problems and shortness of breath, states WebMD. A health care professional can determine whether or not vitamin B-12 deficiency is ... More » Health Nutrition & Diets Nutritional Amounts & Limits

Symptoms of vitamin B-12 deficiency include diarrhea, constipation, lack of appetite, pale skin or heart palpitations, according to WebMD. Fatigue, weakness, a smooth tongue and vision problems also indicate vitamin B-12... More » Health Pain & Symptoms

A mild vitamin B-12 deficiency often causes no symptoms, but an untreated deficiency made lead to weakness, light-headedness, tiredness, sore tongue, pale skin and easy bruising or bleeding, according to WebMD. People ma... More » Health Nutrition & Diets Nutritional Amounts & Limits