Low blood calcium will have a series of neurohumoral, endocrine and organ insufficiency symptoms: 1, the most common is the bone surgery will have serious rickets, hand and foot convulsions, there will be serious osteoporosis, secondary fractures and other situations. 2, in the endocrine system low blood calcium will lead to weakness, anorexia, nausea and other situations. 3, low blood calcium for the circulatory system relative symptoms are more obvious, will The symptoms include chest tightness, shortness of breath, palpitations, precordial discomfort, peripheral weakness, tachycardia, bradycardia, and prolonged QT interval and severe arrhythmia. 4.