When B12 deficiency causes anemia, the body may have to work harder to deliver oxygen. This can lead to shortness of breath, rapid heartbeat, palpitations, chest discomfort, or reduced exercise tolerance.
These symptoms should not be ignored, because they can also be signs of heart or lung problems. If chest pain, fainting, severe shortness of breath, or sudden weakness occurs, seek urgent medical help.
10. Digestive Problems
Some people with vitamin B12 deficiency may experience digestive symptoms such as nausea, loss of appetite, diarrhea, constipation, or weight loss. Mayo Clinic lists stomach problems among symptoms that can happen with very low B12 levels.
Digestive symptoms may also be linked to the cause of the deficiency. For example, some people cannot absorb B12 properly because of stomach or intestinal conditions, certain medications, or pernicious anemia.
Who Is More at Risk of Vitamin B12 Deficiency?
Some people are more likely to develop low B12. Risk is higher in older adults, people who eat little or no animal products, people with pernicious anemia, people who have had stomach or intestinal surgery, and people with digestive conditions that affect absorption.
The NHS notes that vitamin B12 and folate deficiency are more common in older people, affecting around 1 in 10 people aged 75 or over and 1 in 20 people aged 65 to 74.
People taking certain medications may also need monitoring. These may include metformin for diabetes and long-term acid-reducing medicines, depending on individual risk.
Why You Should Not Ignore Nerve Symptoms
