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The possibility that Earth’s geomagnetic activity can affect humans has been debated for many years. Cells in human body are embedded in an environment of both external and internal fluctuating magnetic fields that can affect virtually every circuit in biological systems to a certain degree, depending on the specific biological system and the nature of the magnetic fields. Earth’s magnetic fields fluctuations do not appear to have visible effect on healthy people, but for people with health problems this impact might make them feel worse. It has been shown that magnetic storms are associated with higher risk for heart attack, also heart rhythm disorders, high blood pressure, and breathing difficulties. Rhythms in the Earth’s magnetic field and the human brain and cardiovascular system have the same or similar frequencies. There are some theories as well as experimental data suggesting that changes in these fields can affect human’s autonomic nerves system and cardiovascular systems.