High magnesium will cause harm to various systems of the human body, the neuromuscular system may appear skin flushing, drowsiness and other symptoms, the digestive system may appear diarrhea, nausea and other symptoms, the cardiac system may appear bradycardia and other symptoms, the respiratory system may appear respiratory failure and other symptoms. Magnesium is an essential element in the human body, mostly in the bones, the normal human body magnesium content of about 25 to 30g, magnesium high causes mainly include excessive magnesium intake and magnesium discharge disorders. If the serum magnesium content is higher than 1.25mmol/L, it belongs to hypermagnesemia, hypermagnesemia is mainly manifested as skin flushing, nausea and vomiting, drowsiness, bradycardia, etc., the serious cases can lead to respiratory failure, which will cause harm to the human body’s various systems, so you should seek medical treatment immediately, for the cause of the timely treatment. High magnesium content of food are pumpkin seeds, purple cabbage, sea cucumbers, soybeans, etc. If you suffer from hypermagnesemia, you should abstain from eating high magnesium food to avoid irreversible consequences.