治病英语是 "treat illness"。这个短语来自英语单词 "treat"，意思是治疗，以及单词 "illness"，意思是疾病。例句：

My doctor is treating my illness with medication. 我的医生用药物治疗我的疾病。

The treatment for her illness was successful. 她的疾病治疗成功了。