Magnetic Field Therapy entails the placement of magnetic devices on or near the body for relief of pain and to bring about healing based on the The assumption is that the magnetic fields made by magnets can enter and pass through the human body to affect the functioning of individual cells and improve the working of the nervous system and various organs.
Although haemoglobin, the part of the blood that carries oxygen, is weakly diamagnetic and is repulsed by magnetic fields, the magnets used in magnetic therapy are way way too weak to have any measurable effect.
Magnet therapy is the application of the magnetic field of electromagnetic devices or permanent static magnets to the body for purported health benefits.
These purported benefits may be specific, as in the case of wound healing, or more general, as for increased energy and vitality. In the latter case, malaise is sometimes described as "Magnetic Field Deficiency Syndrome". Some practitioners assign different effects based on the orientation of the magnet
The typical magnet used produces insufficient magnetic field to have any effect on muscle tissue, bones, blood vessels, or organs.
Some manufacturers claim that the magnets help to circulate the blood by interacting with the iron in hemoglobin, a major component of red blood cells. There is no indication that circulatory benefits would result even if some blood component were to couple strongly to magnetic fields.
Others claim that the magnets can restore the body's theorized "electromagnetic energy balance", but no such balance is medically recognised.
There are claims that the south pole of a magnet acts differently on the body than the north pole.