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B-12 symptoms

There are many different symptoms to vitamin B-12 deficiency and frankly not enough information about them. The symptoms usually start mild as the deficiency is mild, you usually don’t even notice symptoms in the beginning. As you become more deficient your symptoms will multiply and intensify.

Anemia is usually the first medical indication that something is not right. It can be a sign that your body is not getting enough vitamin B12. Some of the more common or typical symptoms associated with anemia are feeling tired, weak, and sometimes even a little light headed. The color of your skin may appear to be a little pale. You may also develop problems in your mouth; sore tongue, bleeding gums and sensitivity. When your body is deficient of B12 every cell of your body is affected. However, you feel it most severely in the tissue where your cells would normally divide more rapidly.

With Pernicious Anemia there are not enough healthy red blood cells to carry oxygen throughout the body. On top of this, the blood cells do not divide normally, so they are too large and have trouble getting out of the bone marrow. Because of this you can develop neurological changes like numbness and tingling, especially in your hands and feet. If left untreated these symptoms will become more severe and may become permanent.

Your sleep can also be greatly affected and you may experience restlessness, insomnia and even severe dreams or night terrors. Other symptoms can also include constipation, diarrhea, or gas as well as loss of appetite or weight.

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4 Responses to “B-12 symptoms”


  1. B12 Symptoms at B-12 ANEMIA

    [...] of you know there is the technical list of the B12 deficiency symptoms (you can read about them here and here) and then there are the real symptoms that many of us [...]

  2. Stephanie Bond

    Symptoms which I have had: tubular adenoma – polyps in the stomach; decrease in sweating and body overheating; loss of sleep; anxiety; joint pain; heartburn; forgetfulness; tingling in the hands and feet; occasional numbness in the toes.

    I was just recently tested for B12 and it was found that my levels were 291. I am now taking supplements and receiving monthly shots.

    Are they any long term affects, or anything which I should be looking for?

  3. Ally

    I am new to this site and I posted this yesterday under B-12 What the numbers mean…and it probably should’ve been posted under Symptoms. Sorry!!

    I was born with Iron deficiency anemia and had to be given iron the first several years of my life. My mother was always concerned the anemia would return once I got older, but I didn’t develop any symptoms so it went unchecked. Since the age of 20 I’ve tried to give blood twice and was denied because they said I was “boderline” anemic. Not sure what they meant by that, but of course it was a a local Red Cross so that was as far as the testing went.

    Now I’m a month shy of turning 29 and over the past several years I’ve developed a lot of strange symptoms. And being a really healthy person the symptoms definitely stood out to me as something not normal. I first would get dizzy and light headed randomly. Then over the past year or so I started getting headaches and really feeling mentally not “with it”. I couldn’t remember things that used to come really easily to me, I had a very hard time concentrating, I was irritable and I honestly thought to myself, “wow, surely I’m too young to be losing my memory or to be developing alzheimer’s”. I really felt like I was going crazy. And I also sometime can’t think of simple words when having a conversation with someone. I just feel not as smart as I was, like I’ve somehow back-tracked mentally. Also, at night I would feel like my chest was heavy, not really hurting, but just tight and heavy. Like something was standing on it. And then recently the headaches started getting worse and I would feel like passing out nearly every day. And one day last week my calves and then my thighs felt really tired like I’d been lifting heavy weights, but I hadn’t. Then the next day it was in my arms.

    All of those things are still going on with me, and I went to a new Dr. today to get it checked out. I told him my past history with iron deficiency anemia and they did some blood work. I have a follow up appointment in 2 weeks. I originally was concerned about the iron deficiency coming back, but after reading all of your blogs and everyone’s experiences, I feel like maybe it is B-12 causing the problem. I haven’t been able to really accurately describe what I’ve been feeling, but I can relate completely to all the symptom descriptions on here.

    Can you give me any advice toward handling my Dr. and voicing my concern about B-12 possibly being the reason for my feeling bad?

  4. Ally

    I just received my first CBC results from my doctor….who said everything was “normal”, but I’m not so sure after doing some research. What do you think?

    WBC: 4.8
    RBC: 3.57
    Hemoglobin: 12.0
    Hematocrit: 34.8
    MCV: 97
    MCH: 33.7
    Chloride: 109

    I am either borderline high or low on almost all of those. And I’ve read that a high Chloride count could also be a symptom of anemia. My doctor said everything was normal and when I asked specifically about the possibility of a B12 def. he said, no it was fine. Please let me know what your results were and what would be the best next step to take. I would really appreciate it.

    Thank you.