Mild cases of low potassium may cause no symptoms or symptoms of fatigue and muscle weakness. Patients may be able to recognize their hypokalemia symptoms if specifically instructed or if the patient has recurrent episodes of hypokalemia. The usual initial symptoms are fatigue and muscle weakness.

Transverse myelitis is common in people aged 10-19 and 30-39, causing damage or destruction of myelin, making nerve cells lose the ability to transmit nerve information from the spinal cord to organs in the body.