Itis refers to an inflammation like bronchitis or tonsillitis.

它指的是一种如支气管炎或扁桃体炎的炎症。

But...I get tonsillitis. It could get infected.

但是 我得了扁桃体炎 这有可能会感染的。

One day, he had tonsillitis because he ate too many tonics, such as tomato paste.

一天他得了扁桃腺炎因为他吃了太多的滋补药，比如蕃茄酱。