以咀嚼肌痉挛为主症的低钠性脱水在临床上少见,现报道1例如下。患者,女性,23岁。因频繁紧咬牙伴咀嚼肌痉挛性剧痛8小时入院。患者因误食不洁食物,近一周来反复恶心呕吐,厌食,无腹泻,进食量极少,近两天来未输液。检查:神萎,极度痛苦貌,可见面肌阵发性抽搐,阵发性牙关紧闭,两侧嚼肌扪之较硬,有触痛,勉 Low-sodium dehydration, the main symptom of masticatory muscle spasm, is clinically uncommon. One case is reported below. Patient, female, 23 years old. Due to frequent clench teeth with masticatory muscle spasmodic pain 8 hours admission. Patients due to eating unhealthy food, nausea and vomiting repeated nearly a week, anorexia, no diarrhea, eating very little, no infusion over the past two days. Check: wilted, extremely painful appearance, paroxysmal facial spasm can be seen paroxysmal teeth closed, both sides hardened muscle palpable palpable tenderness, Mian