Natural Earth magnetic field (EMF) is mother cell's division into two baby cells promotor. Cells that divide endlessly are cancer cells distroying organs and organism. Prove that malignant diseases appear in anomalous magnetic fields (AMF). Clarify unclear topics from medicine literature concerning etiopathogenesis. Magnetic fields measuring by protonic magnetometer. Particularly, measuring in patients' beds because of exposition duration. Measurment points per square net 10x10 cms. If measurements discover AMF, the patients are moved into natural EMF and their health conditions followed. The research lasted for 30 years with both sexes and all ages, totalling to 2000 cases. The diseased were in AMF, correlating with diseased organ's location. Shown are AMF surfaces in beds where affected organs were located. On the rest of the beds' surfaces were natural EMF. In a group of 30 patients with breast malignancy with metastastasis and after mamectomy, only 3 survived, thanks to locating in natural EMF.

1. Based upon results, magnetic fields in patients' beds measurements correlation between AMF and the diseased organ's found. 2. Many years following health condition during  patients' stay in natural EMF, health condition improvement and no recidives found. 3. Uncler topics from medical literature, i.e. etiopathogenesis, clerified based upon knowing AMF and natural EMF effects. All presented gives conclusion that AMF located in beds are the only cause of malignant diseases appearance. The discovered cancer cause imposes the obligation to improve treatment and prevention, which is in spending the night and day rest in natural Earth magnetic field.