An examination revealed serum hyponatremia (112mmol/L (n, 135 - 150mmol/L)), a urine sodium concentration of 58mmol/L, a serum osmolality of 234mosm/kg (n, 280 - 300mosm/kg), a urine osmolality of 739mosm/kg (n, 450- 600mosm/kg), an ACTH concentration of 85,9pg/mL (n, 7.2 - 63.3pg/mL), a normal basal cortisol concentration, a normal C-reactive protein (CRP) concentration, a leucocyte count of 11.4 (n, < 10/l), neutrophilia, lymphopenia, and rhabdomyolysis (a maximum creatine kinase (CK) concentration of 76348U/L (n, 1 - 145U/L)). Here, CRP is linked to Hyponatremia.