Correct use of magnets generally does not cause harm to the human body, but if overdose may cause discomfort in the spleen and stomach, poisoning and other adverse reactions, it is recommended to use caution under the guidance of a professional doctor. 1. spleen and stomach discomfort: magnetite taste salty, cold and indigestible, if used improperly a large number of intake of the body is more likely to lead to patients with spleen and stomach inappropriate symptoms, especially patients with weak spleen and stomach or the existence of gastric disorders of the population, if overdosed, it is easy to aggravate the symptoms of discomfort. 2. poisoning: modern research magnets contain iron oxide (Fe₃O₄), but also cadmium, cobalt, calcium, magnesium, potassium, sodium, chromium, manganese, copper, zinc, arsenic and other trace elements. If large amounts of magnets are ingested, there is also a possibility that the patient may experience a toxic reaction. In the use of magnets, should be under the guidance of a professional doctor and combined with personal circumstances to carry out treatment, to avoid blind use of drugs or improper use of drugs to produce adverse reactions, aggravate the symptoms and cause serious effects.