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According to the medical evidence and documentation, acupuncture does really work for anemia, but make sure you talk to your practitioner first.
Keep in mind that you are at a higher risk of bruising from the needles due to your anemia. Be sure to tell your acupuncturist if you have any severe bruising from needling, and I recommend keeping Arnica gel at home. This is an over the counter remedy that can be found at most drug stores and is very effective in treating bruises.
Have fun and enjoy.
1. A single acupuncture treatment is unlikely to help a patient with any condition. Sometimes we're able to hit the nail on the head straight out of the gate and correct an issue with a single treatment. Most of the time you're looking at more like 5-7 treatments with incremental gains after each one. With a condition like anemia, there's no way to know what's happening after a single treatment. Red blood cells have, roughly, a 90 day lifespan and it takes time for your body to manufacture more.
2. A great deal is going to depend on why you have anemia. There are several different models from the perspective of conventional medicine for why a person might be anemic. I'd suggest you start with your primary care physician, have some blood tests run and see if you can figure out what's the root cause. It could be something relatively simple like a B12 or iron deficiency in your diet or it could be something more troubling like a bone marrow issue. It will help you make a more informed decision as to treatment options if you have some good ideas as to why you're experiencing the problem. Knowing where the issue is from a biomedical standpoint will also help your acupuncturist figure out how they're going to treat the problem.
To answer your more general question: yes, acupuncture actually works. We've had lots of excellent studies in the last 10 years or so which tell us:
1. Acupuncture is dose dependent - this means, to a point, more treatments yield better results.
2. Acupuncture is not placebo.
3. When compared head to head against pharmaceuticals for the same condition, acupuncture is usually at least as effective as the drug.
All this being said, for the best results please make sure you're seeing someone who graduated from a Chinese medical school and is licensed as an acupuncturist in your state.