肥大细胞增生症极大多数局限于皮肤,表现为色素性荨麻疹,但有些类型可累及内脏,持别是结节型和发生于成人者,症状可有阵发性潮红,粘膜肿胀,呼吸困难,腹泻和血凝异常等,而神志丧失则极罕见,本文报告一例,并复习有关文献。患者男性,自28岁起患色素性荨麻疹,病情较稳定。自55岁起平均每年2次,无明显诱因,出现轻度晕厥伴面部潮红,胸部压迫感,呼吸困难,醉 Mast cell hyperplasia is mostly confined to the skin, manifested as urticaria pigmentosa, but some types can affect the internal organs, nodular nodules and occurs in adults, the symptoms may have paroxysmal flushing, mucosal swelling, difficulty breathing , Diarrhea and abnormal blood coagulation, etc., and loss of consciousness is extremely rare, this article reports an example, and review the literature. Male patient, suffering from pigmented urticaria since 28 years old, the condition is more stable. Since the age of 55 on average twice a year, no obvious incentive to mild syncope with facial flushing, chest pressure, breathing difficulties, drunk