9 Vitamin-B12 Deficiency Symptoms



Many of the symptoms of vitamin B-12 deficiency arise because it causes a lack of healthy blood cells. The body needs plenty of these cells to get oxygen around the body and keep the organs in good health.

A vitamin B-12 deficiency can lead to both physical and psychological problems. In this article, we explore 9 symptoms of vitamin B-12 deficiency and explain why they occur.

1. Tingling hands or feet

Vitamin B-12 deficiency may cause “pins and needles” in the hands or feet. 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. 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. Without this coating, nerves can become damaged.

Problems are more common in the nerves in the hands and feet, which are called peripheral nerves. Peripheral nerve damage may lead to tingling in these parts of the body.

2. Trouble walking

Over time, peripheral nerve damage resulting from vitamin B-12 deficiency can lead to movement problems.

Numbness in the feet and limbs may make it hard for a person to walk without support. They may also experience muscle weakness and diminished reflexes.

3. Pale skin

Pale or yellow skin, called jaundice, may be a symptom of vitamin B-12 deficiency.

Jaundice develops when a person’s body is not able to produce enough red blood cells. Red blood cells circulating under the skin provide it with its normal colour. Without enough of these cells, the skin may look pale.

Vitamin B-12 plays a role in the production of red blood cells. A vitamin B-12 deficiency can cause a lack of red blood cells, or megaloblastic anaemia, which has an association with jaundice.

This type of anaemia can also weaken the red blood cells, which the body then breaks down more quickly. When the liver breaks down red blood cells, it releases bilirubin. Bilirubin is a brownish substance that gives the skin the yellowish tone that is characteristic of jaundice.

4. Fatigue

Megaloblastic anaemia due to vitamin B-12 deficiency may lead to a person feeling fatigued.

Without enough red blood cells to carry oxygen around their body, a person can feel extremely tired.

5. Fast heart rate

A fast heart rate and shortness of breath may be symptoms of vitamin B-12 deficiency.

A fast heart rate may be a symptom of vitamin B-12 deficiency.

The heart may start to beat faster to make up for the reduced number of red blood cells in the body.

Anaemia puts pressure on the heart to push a higher volume of blood around the body and to do it more quickly. This response is the body’s way of trying to ensure that enough oxygen circulates through all of the body’s systems and reaches all the organs.

6. Shortness of breath

Anaemia that results from vitamin B-12 deficiency may cause a person to feel a little short of breath. It is possible to link this to a lack of red blood cells and a fast heartbeat.

7. Mouth pain

Vitamin B-12 affects oral health. As a result, being deficient in vitamin B-12 may cause the following mouth problems:

  1. Glossitis, which causes a swollen, smooth, red tongue

  2. Mouth ulcers

  3. A burning sensation in the mouth

These symptoms occur because vitamin B-12 deficiency causes a reduction in red blood cell production, which results in less oxygen reaching the tongue.

8. Problems thinking or reasoning

Vitamin B-12 deficiency may cause problems with thinking, which doctors refer to as cognitive impairment. These issues include difficulty thinking or reasoning and memory loss.

One study even linked low vitamin B-12 levels to an increased risk of Alzheimer’s disease, vascular dementia, and Parkinson’s disease.

The reduced amount of oxygen reaching the brain might be to blame for the thinking and reasoning problems.

9. Irritability

Being deficient in vitamin B-12 can affect a person’s mood, potentially causing irritability or depression.

There is a need for more research into the link between vitamin B-12 and mental health. One theory is that vitamin B-12 helps break down a brain chemical called homocysteine. Having too much homocysteine in the brain may cause mental health problems.

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