noun
nausea; urge to vomit
Medical term for the sensation of nausea or feeling sick to one's stomach. In casual contexts, 吐き気 is more common.
抗がん剤の副作用で悪心が続いている。
I have persistent nausea as a side effect of the anticancer drug.
食後すぐに悪心を感じた。
I felt nausea right after eating.