Usually the causes of deficiency are as follows: First, the most common is hypoglycemic reaction, when the body’s blood sugar is lower than 3.9mmol/L, there will be dizziness, panic, palpitations, body weakness, cold sweat and other symptoms of deficiency, such as blood sugar continues to fall will appear hypoglycemic coma symptoms of deficiency. Second, common diseases such as acute cardiac insufficiency, especially in the aortic insufficiency or acute coronary syndrome in the early stage will appear symptoms of deficiency, but then the deficiency is accompanied by chest tightness, shortness of breath, precordial discomfort, angina pectoris symptoms. Third, common diseases that make people deflate also include cerebrovascular insufficiency of blood supply, when the acute cerebrovascular insufficiency of blood supply will make the head dizzy and intense, then it will be accompanied by a transient decrease in blood pressure or sudden blood pressure can not be measured, then there will be deflated. Fourth, in summer, there are also patients who suffer from heatstroke and suffer from deficiency. In addition, rare diseases such as hyperthyroidism and hyperadrenalism may also lead to deficiency after excessive exercise, and some women may also experience clinical symptoms of deficiency due to anemia caused by excessive menstruation during the physiological period, resulting in a transient decrease in blood pressure.