绝大多数地方性甲状腺肿是由于缺碘引起的,但某些流行区并不缺碘,因而使人想到碘缺乏并不是致甲状腺肿的唯一原因。天津医学院朱宪彝等,曾指出,硝酸盐能抑制甲状腺摄取无机碘,1978年吉林市环境水文地质站对市近郊7个乡地下水普查资料表明,市郊松花江沿岸硝酸盐污染严重,江南沿岸地下水 The vast majority of endemic goiter is caused by iodine deficiency, but not iodine deficiency in some endemic areas, thus reminding people that iodine deficiency is not the only cause of goiter. Tianjin Medical College, Zhu Xiangyi, etc., have pointed out that nitrate can inhibit thyroid uptake of inorganic iodine, 1978, Jilin City Environmental Hydrogeology Station on the suburbs of seven townships groundwater census data show that the suburbs of the Songhua River along the coast of serious nitrate pollution, Jiangnan coast groundwater