Low blood potassium is called hypokalemia, and the symptoms it causes vary depending on the speed and degree of the low blood potassium and the severity of the abnormal intra- and extracellular potassium concentration. In chronic, mild cases, the symptoms are mild or absent, while in acute and rapidly occurring severe symptoms are often severe and in some cases fatal. The most common manifestation is that it can affect all systems of the body, such as generalized muscle weakness, limb weakness or limb numbness, pain, nausea, vomiting, constipation, and people may feel unrefreshed and unresponsive. The effect on the heart can cause myocardial necrosis. Long-term severe potassium loss, that is, low blood potassium, can lead to necrosis of renal tubular epithelial cells, and the patient will show excessive drinking and urination.