RT Journal Article SR Electronic T1 Persistent hypokalaemia and intermittent muscle weakness JF Practical Neurology JO Pract Neurol FD BMJ Publishing Group Ltd SP 518 OP 520 DO 10.1136/pn-2022-003433 VO 22 IS 6 A1 Monika Rabenstein A1 Angela Abicht A1 Anna Brunn A1 Helmar Lehmann A1 Gilbert Wunderlich YR 2022 UL http://pn.bmj.com/content/22/6/518.abstract AB A man in his 20s gave a 9-year history of recurrent muscle pain and weakness, occurring mostly after exercise, and lasting for up to 2 days. There had been one episode of severe rhabdomyolysis after cold exposure. He also had longstanding hypokalaemia, which was key to his correct diagnosis but was not followed. This case highlights the importance of an appropriately methodical investigation of weak hypokalaemic patients, and the relevance of hypokalaemia as a cause of neuromuscular symptoms not related to muscular channelopathies.Data are available on reasonable request. The patient’s clinical data are available on request.