查加斯病（英语：Chagas disease），又称为美洲锥虫症（American trypanosomiasis），是一种热带疾病寄生虫疾病；致病原是美洲锥虫，通常借由俗称为亲吻虫的锥鼻虫传播。感染的症状随着疾病的进程而改变。在感染初期，以下症状的表征严重度不一：发烧、淋巴结肿大、头痛或是被叮咬位置的局部肿大。叮咬后8到12周，疾病进入慢性期，60%到70%不再出现新症状。其他30%到40%的人，在初次感染后的10到30年间，会出现更多症状。这些症状包括心室扩大，其中20到30%甚至会导致心脏衰竭。有将近10%的人会有食道扩张或是巨结肠症的症状。

Chagas disease, also known as American trypanosomiasis, is a tropical parasitic disease caused by the protozoan Trypanosoma cruzi. It is spread mostly by insects known as Triatominae or kissing bugs. The symptoms change over the course of the infection. In the early stage, symptoms are typically either not present or mild, and may include fever, swollen lymph nodes, headaches, or local swelling at the site of the bite. After 8–12 weeks, individuals enter the chronic phase of disease and in 60–70% it never produces further symptoms. The other 30 to 40% of people develop further symptoms 10 to 30 years after the initial infection, including enlargement of the ventricles of the heart in 20 to 30%, leading to heart failure. An enlarged esophagus or an enlarged colon may also occur in 10% of people.