Can b12 deficiency cause numbness and tingling?

Advertisement. Vitamin B12 deficiency may result in anemia, which can cause symptoms including light-headedness, weakness, shortness of breath, pale skin, difficulty concentrating and fatigue. A chronic shortage of vitamin B12 may also cause nerve damage that leads to tingling and numbness in hands and feet.

Does B12 mask symptoms? You may not experience any symptoms of a B12 deficiency. Some patients, especially those with a mild deficiency, remain asymptomatic unless the deficiency turns into anemia. Busy lifestyles can sometimes mask the symptoms of not having enough B12.

Why does B12 cause insomnia? In addition to that, B12 is linked to the production of melatonin which controls our circadian rhythms (the bodily function that regulate sleep patterns). A decrease in melatonin can make falling asleep more difficult and may, in some instances, prohibit sleep entirely–thereby causing serious insomnia.

Does B12 cause swelling of the feet? Although vitamin B12 injections are generally safe, some adverse reactions may occur. Always consult a medical professional if adverse reactions occur after receiving medications. A possible reaction to a cyanocobalamin injection is swelling. The swelling may occur in the arms, legs, hands, ankles and feet.

Does low B-12 cause dizziness? Symptoms of low B-12 include feeling lightheaded or dizzy. However, dizziness can be attributed to a number of health conditions, so see your doctor to have the condition formally diagnosed. Part of the B-complex, vitamin B-12 is a vital part of both nerve and blood cells.



The symptoms include:

  • Skin pallor and yellowing of Skin
  • Extreme weakness and fatigue
  • Sensations of pins and needles due to nerve damage
  • Glossitis and mouth ulcers
  • Breathlessness and dizziness
  • Mood changes: depression, psychosis and irritability
  • Some loss in sense of touch, walking and vision problems
  • Symptoms of dementia
  • Loss of appetite and weight loss


  • It occurs due to decreased intake of the vitamin, increased requirements or poor absorption.
  • Decreased intake :
  • People in a strict vegan diet
  • Decreased absorption:
  • In the elderly especially due to lack of intrinsic factor that aids in B-12 absorption (pernicious anemia)
  • In people who have undergone surgery involving removal of the section of the bowel responsible for B-12 absorption
  • Atrophic gastritis
  • People on metformin for diabetes
  • People on chronic use of anti-acid drugs and protein pump inhibitors
  • The risk factors include:
  • Vegans
  • Pregnancy
  • Alcohol
  • Certain medications which block absorpition of vitamins


By eating a balanced diet including meat, poultry, cheese, milk among others.


If untreated for a prolonged period it may lead to

  • Vascular disease including stroke, pulmonary embolism due to elevated homocysteine
  • Memory loss
  • Ataxia
  • Peripheral neuropathy
  • depression

What are the treatment options?What diet is recommended?How is this diagnosed?For informational purposes only. Consult a medical professional for advice.Reviewed by a panel of doctors. Source: Focus Medica. Was this helpful?How to counter the masking effect of vitamin B12 deficiency? Also, the United States legislation has required enriched flour to contain Folic Acid to reduce cases of birth defects. To counter the masking effect of B12 deficiency the National Institute of Health recommends “Folic Acid intake from fortified food and supplements should not exceed 1,000 mcg daily in healthy adults.”

What are the symptoms of a vitamin B12 deficiency? If you have vitamin B12 deficiency, you could become anemic. A mild deficiency may cause no symptoms. But if untreated, it may lead to symptoms such as: Weakness, tiredness, or lightheadedness. Heart palpitations and shortness of breath. Pale skin. A smooth tongue.

Are there any health risks from vitamin B12? Health Risks from Excessive Vitamin B12. In Dietary Reference Intakes: Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline, the IOM states that “no adverse effects have been associated with excess vitamin B12 intake from food and supplements in healthy individuals” [ 5 ].

Can a folate deficiency mask a VitaminB12 deficiency? Folate deficiency can sometimes mask a vitaminB12 deficiency because it covers up the effects of megaloblastic anemia which alack of B12 can cause. Supplementation with methylfolate does not cover up this type of anemia in the same way, so it can be easier to differentiate between the lack of B9 or B12.