What happens if a B12 deficiency goes untreated?

If left untreated, a Vitamin B12 deficiency can cause severe, potentially irreversible damage to your nervous system and brain, leading to issues like memory loss, difficulty walking or speaking, paralysis, depression, and anemia, plus serious pregnancy complications and increased cancer risk. While early symptoms are treatable, prolonged deficiency can result in permanent nerve damage and cognitive impairment, affecting coordination, vision, and mental health.

What happens if B12 is low for too long?

A prolonged vitamin B12 deficiency can cause severe health issues, primarily affecting the nervous system and blood, leading to anemia, fatigue, cognitive decline (memory loss, confusion, dementia), neurological damage (pins and needles, balance problems, paralysis), mood changes (depression, paranoia), and potentially irreversible nerve damage, heart problems, infertility, and developmental issues in infants. 

Can B12 cause headaches?

Yes, Vitamin B12 can cause headaches, both from a deficiency (low levels) and sometimes from taking very high doses of supplements, leading to side effects like headache, dizziness, or fatigue. Deficiency can cause headaches due to nerve irritation or reduced oxygen to the brain, while excess B12 (especially injections) might trigger headaches, nausea, or weakness, though it's generally considered safe.
 

What are the worst symptoms of B12 deficiency?

The worst B12 deficiency symptoms involve severe nerve damage and mental changes, including persistent numbness/tingling, balance/walking difficulties (ataxia), confusion, memory loss, vision problems, psychosis, and hallucinations, which can become permanent if untreated; also severe fatigue, shortness of breath, and heart palpitations signify serious anemia.
 

Can B12 cause tingling in fingers?

If you have had neurological symptoms that affect your nervous system, such as numbness or tingling in your hands and feet, caused by a vitamin B12 deficiency, you'll be referred to a haematologist and may need to have injections every 2 months.

Woman Believed She Was Going to Die Due to B12 Deficiency Symptoms | This Morning

What are the facial signs of B12 deficiency?

Cutaneous manifestations associated with vitamin B12 deficiency are skin hyperpigmentation, vitiligo, angular stomatitis, and hair changes. A diagnosis of vitamin B12 deficiency is often overlooked in its early stages because these signs are not specific to vitamin B12 deficiency alone.

What does B12 neuropathy feel like?

Peripheral neuropathy is the most common presentation of vitamin B12 deficiency. Depending upon the type of nerve involved, it may present as pain, numbness, tingling, loss of sensation, decreased motor activity, or decreased muscle mass.

What do you crave when your B12 is low?

B12 deficiency can cause specific food cravings, particularly for meat, fish, or eggs, as your body seeks sources of the vitamin, and may also lead to sugar cravings due to its role in serotonin and energy regulation, but it can also manifest as pica (craving non-food items like ice or even bleach in severe cases). These cravings signal your body trying to correct a nutrient imbalance, but clinical testing is needed for a proper diagnosis, as emotional factors also drive cravings. 

What is a Stage 4 B12 deficiency?

Stage 4 B12 deficiency is the severe, clinical stage, marked by significant neurological issues like nerve damage (spinal cord degeneration, numbness, paralysis risk), cognitive decline (memory loss, confusion), and severe anemia (megaloblastic anaemia), leading to fatigue, depression, and balance problems, requiring urgent treatment with B12 injections to prevent permanent damage, as symptoms overlap with other neurological conditions.
 

What level of B12 is dangerously low?

A dangerously low B12 level is generally considered below 200 pg/mL, often leading to symptoms like fatigue, nerve issues (numbness, tingling), anemia, and cognitive problems, with levels under 100 pg/mL in older adults signaling a more severe deficiency, though even borderline levels (200-300 pg/mL) warrant further testing, especially with symptoms, using markers like methylmalonic acid (MMA) for accuracy.
 

Can low B12 cause ear pain?

[5,6] In addition, low levels of Vitamin B12 and folate are associated with the destruction of the microvasculature of the stria vascularis, which might result in decreased endocochlear potential and in hearing loss and tinnitus.

Can B12 cause blood clots?

Vitamin B12 deficiency can indirectly increase blood clot risk by causing high homocysteine levels, a known clot-promoting factor, while very high B12 levels, especially in cancer patients or post-surgery, have also been linked to thrombosis (blood clots), making its role complex, but generally, deficiency is the main concern for clotting issues. 

What deficiency causes you to feel off balance?

Feeling off-balance, dizzy, or unsteady (ataxia) can be caused by deficiencies in Vitamin B12, crucial for nerve function, and Vitamin D, important for nerve signals and muscle tone, with Iron deficiency (anemia) also a common culprit due to poor oxygen supply to the brain, alongside potential roles for magnesium. These deficiencies affect your nervous system, proprioception (body awareness), and circulation, leading to balance issues, numbness, fatigue, and cognitive problems. 

What cancers are associated with low B12?

Cancers affecting the gastrointestinal tract (stomach, colon, pancreas, esophagus) and blood cancers (leukemia, lymphoma) are commonly linked to B12 deficiency, primarily by disrupting absorption or production; tumors can block nutrient uptake, damage stomach lining (reducing intrinsic factor), or impair bone marrow function, making B12 deficiency a potential sign of underlying malignancy, though it has other causes too.
 

What are the permanent damages caused by B12 deficiency?

Neurological changes

memory loss. pins and needles. loss of physical co-ordination (ataxia), which can affect your whole body and cause difficulty speaking or walking. damage to parts of the nervous system (peripheral neuropathy), particularly in the legs.

Can B12 deficiency cause blurry vision?

Disturbed or blurred vision can also occur as a result of a Vitamin B12 deficiency. This happens when the deficiency causes damage to the optic nerve that leads to your eyes. The nervous signal that travels from the eye to the brain is disturbed due to this damage, leading to impaired vision.

What illness causes low B12?

B12 deficiency is often caused by pernicious anemia (an autoimmune issue blocking absorption), gastrointestinal disorders (like Crohn's, celiac, or atrophic gastritis), stomach/intestinal surgery (bariatric, gastrectomy), genetic conditions, chronic pancreatitis, or even a vegan diet or alcoholism, all leading to poor absorption or intake of this vital vitamin.
 

What are the injections for B12 deficiency?

Vitamin B12 injections are prescribed to treat or prevent deficiency, especially when the digestive system can't absorb it from food, bypassing issues like pernicious anemia, Crohn's, or certain surgeries, by delivering high doses directly into the muscle, restoring levels and alleviating fatigue, nerve issues, and cognitive problems, though side effects like pain or headache can occur. Treatment often starts with frequent shots, then moves to maintenance with injections or oral supplements.
 

Why do I feel worse after my B12 injection?

If you feel worse after your B12 injection, you're not alone, and it doesn't mean something is wrong with the treatment. In many cases, it's a temporary response as your body starts healing and adjusting to better nutrition.

Which fruit is B12 rich?

Apples and bananas help improve gut health, supporting better B12 absorption. Some fortified fruit juices (like orange juice) may include added B12.

How did my B12 get so low?

Some people can develop a vitamin B12 deficiency as a result of not getting enough vitamin B12 from their diet. A diet that includes meat, fish and dairy products usually provides enough vitamin B12, but people who do not regularly eat these foods can become deficient.

What are the mental symptoms of B12 deficiency?

Vitamin B12 deficiency can cause significant mental and psychiatric issues, including depression, anxiety, irritability, confusion, memory loss, and difficulty concentrating, ranging from mild to severe. More serious symptoms can involve psychosis, hallucinations, delusions, delirium, apathy, and even dementia-like states, affecting mood, cognition, and perception. These neuropsychiatric symptoms can sometimes appear before or without typical physical signs like anemia. 

What are the first signs of neuropathy?

The first signs of neuropathy often involve tingling, numbness, or "pins and needles," usually starting in the feet and hands, along with heightened sensitivity to touch (even light pressure), or burning/sharp pain, especially at night, sometimes feeling like walking on "stones" or "bubble wrap". Other early indicators include muscle weakness, clumsiness, balance problems, and changes in temperature sensation, with symptoms often fluctuating and worsening over time. 

Can low B12 make your feet hurt?

You might want to investigate a B12 deficiency if you are experiencing foot pain or lower limb pain. Vitamin B12 is an essential nutrient, primarily found in animal products, that plays a key role in maintaining nerve function, producing red blood cells, and synthesizing DNA.