Symptoms of vitamin B12 deficiency include fatigue, low mood, and nerve problems.
Vitamin B12 plays an important role in the production of red blood cells and keeping nerves healthy.
This symptom occurs because the vitamin plays a crucial role in the nervous system, and its absence can cause people to develop nerve conduction problems or nerve damage.
In the nervous system, vitamin B-12 helps produce a substance called myelin, said Medical News Today.
The site added: “Myelin is a protective coating that shields the nerves and helps them transmit sensations.
“People who are vitamin B-12 deficient may not produce enough myelin to coat their nerves.
“If B12 deficiency is not treated, a tingling pain may begin to occur along the outside edge of the hand, starting from the wrist