To determine whether your body is deficient in potassium, you can judge by your own physical symptoms as well as electrolyte tests. 1. Judging from one’s own physical symptoms: Since potassium is involved in nerve and muscle conduction, potassium deficiency can lead to cramps or muscle spasms, and in severe cases, seizure paralysis may occur. In addition, potassium deficiency may also affect the digestive function of the patient, resulting in nausea, vomiting and loss of appetite. Severe potassium deficiency may affect the heart function and lead to cardiac arrhythmia. 2. Electrolytes: Patients can go to the hospital for electrolyte examination to determine whether they are suffering from potassium deficiency. The normal range of blood potassium is 3.5~5.5mmol/L, below 3.5mmol/L suggests that the patient is suffering from hypokalemia, and this is the best way to confirm the diagnosis. As some patients with potassium deficiency have atypical symptoms, if you suspect that you are suffering from potassium deficiency, you should go to the hospital for electrolyte examination in time to avoid delaying your condition.