Portuguese 
English 
Spanish 
4 min of reading 
0 comments 
Vitamin B12 deficiency affects about 15% of seniors over 65 years old, silently destroying nerve protection and often only discovered when tingling has turned into permanent loss of sensitivity in the hands and feet.
Everyone has shaken their hand after waking up with that numbness in their fingers. Normal, wrong position, tight circulation, it passes in two minutes. But when tingling appears every day, in any position, morning and night, and starts to come with a fatigue that no coffee can solve, the body is not complaining about posture. It is complaining of hunger. Of a specific hunger that most people don’t even know exists.
Vitamin B12 is responsible for keeping the myelin sheath intact, the layer that covers and protects each nerve in the human body. When it drops, the nerves begin to deteriorate without giving any dramatic signs. Just tingling. Just fatigue. Just memory failing. And when the person finally goes to investigate, the damage may already be done.
Why is B12 so important for the nerves?
The myelin sheath functions like the rubber cover that surrounds an electrical wire. Without this protection, the signal that comes from the brain and needs to reach the tips of the fingers starts to get lost along the way. The result is tingling, numbness, a prickling sensation, and even burning in the hands and feet.
-
While Paris suffocates with 100 million tourists a year, there are 7 countries in Europe that almost no one visits and that offer castles with views of the Alps, wines at juice prices, untouched beaches, and streets without a single selfie stick in sight.
-
The Sun emits strange “voice” captured by a telescope and antenna, and radio signals from a solar spot the size of Earth are surprising.
-
This is the weaponry that the smallest army in the world uses on a daily basis.
-
World’s largest floating library: at 132.5 meters long, Logos Hope is the largest floating book fair in the world, welcoming thousands of visitors each day and bringing over 5,000 titles to ports across various continents.
And the worst part: since B12 is stored in large quantities in the body, the reserves can take 3 to 5 years to deplete. This means that when tingling appears, the problem has been brewing for a long time.
And this is where things get serious.
What happens to those who take too long to investigate?
Nerve damage can become irreversible. The MSD Manual warns that severe vitamin B12 deficiency causes loss of reflexes, difficulty walking, mental confusion, and even dementia.
A meta-analysis published in the European Journal of Neurology analyzed 46 observational studies and 7 intervention studies and concluded that patients with peripheral neuropathy had significantly lower levels of B12.
The researchers were direct: anyone with symptoms of neuropathy should investigate the deficiency before anything else.
But tingling is not the only sign.
What other symptoms accompany B12 deficiency?
The body sends out alerts in layers. First comes the chronic fatigue that doesn’t improve with rest. Then mood changes, difficulty concentrating, and memory lapses that the person attributes to stress. The skin may darken in areas like the hands and joints. Cracks at the corners of the mouth appear without explanation. The tongue becomes sensitive and reddened.
When all of this comes along with tingling in the hands, the picture strongly points to B12 deficiency.
Who is at greater risk of having low B12?
Vegetarians and vegans who do not supplement are at the top of the list, as B12 comes almost exclusively from animal-derived foods. Seniors over 65 years old are also at risk, as about 15% of people in this age group already show laboratory evidence of deficiency, according to data from the MSD Manual.
Those taking omeprazole, pantoprazole, or metformin for an extended period need to be cautious: these medications interfere with vitamin absorption. And those who have undergone bariatric surgery have their digestive system altered in a way that further complicates the absorption of B12.
How to confirm if tingling is due to B12 deficiency?
A simple blood test resolves it. The measurement of vitamin B12 in the blood shows if the levels are adequate. In some cases, the doctor may also request the measurement of homocysteine and methylmalonic acid, two markers that rise when B12 is low, even if the main result seems to be within the normal range.
Treatment varies: it can be dietary adjustments with red meats, liver, salmon, tuna, eggs, and dairy products, or supplementation with methylcobalamin tablets and injections when the diet is insufficient.
Tingling in the hands is not a trivial matter, it is not just too much cellphone use, and it is almost never just posture. It can be the body begging for the vitamin that keeps every nerve functioning, and the longer you ignore it, the less chance you have of reversing it.
With information from Tua Saúde, MSD Manual, and European Journal of Neurology.
Seja o primeiro a reagir!