看英文定義，Self-limiting跟吃藥後是否改善無關，指的是不吃藥也可以痊愈的疾病。

Self-limiting (a.k.a. self-recovering) is a term used in clinical medicine to refer to any disease whose natural history is to resolve without treatment. Many viral illnesses, e.g. upper respiratory tract infections, are self-limiting as patients will recover without taking any form of medicine.

任何幹預，包括喝白開水，都可能加速或者延緩恢複。

自限這個詞也不是指所有人都能夠恢複，隻是在統計學上針對大多數人成立。