Shortness of Breath

B12 deficiency anemia can cause a person to feel short of breath. This is believed to be due to fewer red blood cells and a fast heartbeat. If you are experiencing trouble breathing, you should see a healthcare professional right away.

Gastrointestinal Symptoms

A B12 deficiency may cause symptoms such as bloating, gas, nausea, diarrhea, constipation, decreased appetite, and weight loss. It is believed these symptoms occur because the digestive tract does not get enough oxygen due to a lack of red blood cells.

Mouth Pain and Inflammation

A deficiency of vitamin B12 or other nutrients can cause inflammation and pain of the tongue (the medical term is glossitis). Sores and inflammation can also develop inside the mouth (stomatitis). It is common for people with B12 deficiency anemia to have glossitis and stomatitis. These can be signs of an early B12 deficiency or other nutritional deficiencies like folate, vitamin B2 (riboflavin), and vitamin B3 (niacin) deficiency.