Nocturnal Muscle Cramps: Causes and Associated Factors

Medication-Induced Causes

Diuretics, particularly in patients with ascites or heart failure, strongly predispose to nocturnal leg cramps and should be reviewed immediately, as recommended by the European Association for the Study of the Liver 1
Calcium channel blockers and lithium can also contribute to nocturnal leg cramps, according to the European Urology guidelines 2

Hypokalemia (low potassium) and hypomagnesemia (low magnesium) can exacerbate cramps, and should be checked and corrected, as suggested by the Hepatology guidelines 1

Liver disease with cirrhosis, particularly in patients on diuretics for ascites, increases cramp frequency, as noted by the Hepatology guidelines 1
Neurological conditions causing lower limb weakness, abnormal gait, or tremor can also contribute to nocturnal leg cramps, according to the European Urology guidelines 2, 3

The European Urology guidelines recommend checking electrolytes, renal function, thyroid function, calcium, and HbA1c to identify metabolic derangements, and reviewing all medications critically, as drug-induced cramps are common and reversible 2, 3
Assessing for peripheral edema and examining for neurological signs, including lower limb weakness, abnormal gait, speech disturbances, or tremor, is also crucial, as suggested by the European Urology guidelines 2, 3
Screening for sleep disorders, including obstructive sleep apnea, which may coexist with nocturnal leg cramps, is recommended by the European Urology guidelines and the Praxis Medical Insights 4, 6