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B12 Deficiency Tingling: Who Is at Risk and How a Blood Test Settles It
B12 deficiency tingling is real: NIH says low vitamin B12 can cause numbness and tingling in the hands and feet. Older adults, vegans, people on some medicines and those with stomach disorders are among those at risk. A blood test settles it. Flow Nerves does not list B12 among its six names.
Written by the Flow Nerves label deskUpdated · 4 min read
The link
Can low B12 cause tingling?
Yes. NIH says vitamin B12 deficiency can cause neurological changes such as numbness and tingling in the hands and feet (NIH ODS, Vitamin B12).
Mayo Clinic and Cleveland Clinic both list B vitamin shortfalls among the causes of nerve damage in the limbs (Mayo Clinic, Peripheral neuropathy) (Cleveland Clinic, Peripheral neuropathy). Other causes exist too, so a test matters.
At-risk groups
Who is at risk of low B12?
NIH names several groups as most likely to be B12 deficient. Your doctor knows which fit you.
| Group | Why, per NIH |
|---|---|
| Older adults | Stomach conditions such as atrophic gastritis |
| People with pernicious anemia | A condition that blocks absorption |
| Stomach or bowel disorders or surgery | Celiac, Crohn's, weight-loss surgery |
| Vegans and some vegetarians | Little B12 in the diet |
| People on some medicines | Metformin and acid reducers are named |
All rows come from the NIH fact sheet (NIH ODS, Vitamin B12).
Testing
How does a blood test settle it?
A blood test measures B12 directly, so it settles the question better than a guess. NIH says B12 status is typically assessed by measuring serum or plasma B12 (NIH ODS, Vitamin B12).
Some doctors add a second marker, methylmalonic acid, when the first result is borderline. Cutoffs vary by lab, so let your doctor read the result.
Do not start a high-dose vitamin before the test. Ask first.
Red flags
When does tingling need urgent care?
Tingling with weakness, falls or a sudden change needs a doctor now. Chest pain, trouble speaking or a weak or numb side of the body needs 911.
- Sudden weakness or numbness on one side, trouble speaking, chest pain, trouble breathingThese can signal an emergency. Do not wait.Call 911
- Swelling of the lips, face or throat, hives, or trouble breathing after a supplementAllergic reactions to butcher's broom can be serious, WebMD says. Stop and call 911.Call 911
- Confusion, shaking, sweating or a very fast heartbeat if you take diabetes medicineThese can be signs of low blood sugar, and very low blood sugar needs treatment right away, NIDDK says.Call 911
- New tingling, weakness or pain in your hands or feetMayo Clinic says to seek medical care right away. Early diagnosis gives the best chance of managing symptoms.See a doctor
- A foot sore that is infected or will not healCDC lists it among the reasons to call your doctor if you have diabetes.See a doctor
- Falls, lost coordination or muscle weaknessMayo Clinic lists them as symptoms to have checked.See a doctor
- Burning, tingling or pain that disrupts your day or your sleepCDC says to call your doctor, and to keep notes on the symptoms to share.See a doctor
- Changes in digestion, urination or sexual function, dizziness or faintingCDC lists these with nerve damage in people with diabetes.See a doctor
Signs from (Mayo Clinic, Peripheral neuropathy) and (CDC, Diabetes and nerve damage). This list is not complete, and a supplement is never a reason to wait.
The product
Does Flow Nerves contain B12?
No. Flow Nerves names six ingredients, and B12 is not one of them. It is not a B12 product, and it makes no claim about B12.
Ask a doctor about testing first. The live checkout is final on price.
FAQ
Flow Nerves questions people ask
What does B12 deficiency tingling feel like?
Mayo Clinic lists prickling or tingling in the feet or hands, a feeling of wearing gloves or socks, and weakness among nerve symptoms (Mayo Clinic, Peripheral neuropathy). Many causes look alike, so test.
Which blood test checks B12?
A serum or plasma B12 level is the usual test, per NIH (NIH ODS, Vitamin B12). Your doctor may add other markers. Ask which fits you.
Can diet alone cause low B12?
Yes, for vegans and some vegetarians, NIH says, because they eat few or no animal products (NIH ODS, Vitamin B12). Ask a doctor or dietitian before changing what you take.
Can Flow Nerves stand in for B12?
No. It lists no B12, and it is not a medicine. Ask your doctor about testing and what to do with the result.
Who wrote this
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