地方性甲状腺肿(以下称地甲病)的流行区是比较广泛的。多流行在山岳、高原及远离海洋的内陆地区。从流行区地质地形来看,多发于沙土、土层浅薄的古河道和富有沼泽泥灰土的低洼地,以及土壤淋溶作用较强的山地粗骨土和河流两岸。除了这种地区性多发特点 Endemic goiter (hereinafter referred to A) prevalence area is more extensive. More popular in the mountains, plateaus and outback areas far from the sea. Geological topography from the prevailing area point of view, occur in the sand, shallow shallow ancient river courses and swampy shale low-lying land, as well as strong soil leaching strong mountain bones and rivers. In addition to this regional multiple features