If you're under the weather, don't go to work.

如果你身体不舒服，就不要去上班了。

I was still feeling a bit under the weather.

我仍觉得身体有些不舒服。

Emma stayed home from school yesterday because her temperature was on the high side.

Emma昨天呆在家没去学校，因为她发烧了。

The aspirin seems to quiet the headache.

阿司匹林可以减轻头疼。

I woke up from a splitting headache this morning.

今天早上我从剧烈的头疼中醒来。

My whole body hurts. I might have the flu.

我全身疼，可能得流感了。

My back is really hurting me today.

我今天背疼得厉害。