Fast heartbeat and numbness may be caused by electrolyte metabolism disorder or cardiac arrhythmia, or it may be caused by hyperventilation, in order to make a clear diagnosis, we need to combine with the patient’s medical history, and carry out laboratory tests if necessary. Electrolyte metabolism disorder mainly refers to hypokalemia can lead to sinus tachycardia, atrial tachycardia, etc. Potassium deficiency can cause limb weakness and numbness, and if blood tests of electrolytes can be used to make a clear diagnosis, and oral and intravenous potassium supplementation can be given to alleviate the symptoms. Arrhythmia can also cause fast heartbeat and numbness of the whole body, such as paroxysmal supraventricular tachycardia, due to the fast heartbeat and panic symptoms, the heart’s effective ejection volume is reduced, resulting in poor peripheral circulation, insufficient cerebral blood supply causes numbness of the limbs. Hyperventilation can also cause fast heartbeat numbness, mainly associated with excessive emotional fluctuations, shortness of breath leads to respiratory alkalosis, there will be numbness fast heartbeat symptoms, accompanied by chest tightness, improve the laboratory examination and there is no obvious abnormality, you can replenish fluids, calm emotions, relieve symptoms. Fast heartbeat numbness of the whole body, may be a pathological disease, may also be caused by emotional fluctuations, but to clarify the diagnosis and early treatment, need to go to the hospital.