Clinical characteristics of the groups of hyponatremia causes Causes symptoms CSWS (n=44) SIADH (n=60) Unknow cause (76) p Headache 17 (38, 64%) 35 (58, 33%) 52 (43, 9%) <0.01 Dehydrated dry skin 12 (27, 27%) 0 0 0.00 Dysphagia 29 (65.9%) 23 (38, 3%) 19 (25, 0%) <0.01 24-hour urine (ml) 3547.95± 1161.45 2463.52 ± 974.98 2629.93 ±1086.42 <0.01 Comment: Dehydrated dry skin was only seen in patients with hyponatremia due to CSWS (p <0.05).