sickness

Compared meaning: the state of being ill (noun).

比较义项：患病、生病的状态（名词）。

• illness

  The more general, neutral word for being unwell; used for both short and long-term or serious conditions, and common in formal or medical contexts.

  更通用、更中性的“患病”说法，可指短期或长期、较严重的健康问题，常用于正式或医学语境。

  Her long illness kept her in and out of hospital for two years.

  她长期患病，两年里反复进出医院。

• sickness 本词

  Common in everyday British English, especially in fixed phrases about work and pay, such as sickness leave or sick pay; can sound slightly less formal than illness.

  在英式英语的日常表达中很常见，尤其用于与工作、薪酬相关的固定搭配，如 sickness leave（病假）或 sick pay（病假工资），语气比 illness 略不那么正式。

  He didn't get paid because he'd used up all his sickness leave.

  他没拿到工资，因为他的病假已经用完了。

Illness and sickness are close in meaning and often interchangeable. Illness is more general and neutral, used for short or long-term health problems, common in medical writing. Sickness is common in British English, in phrases like sickness leave. Sickness meaning nausea is not compared.

这两个词在“生病”这一义项上非常接近，常可互换；但 sickness 在英式英语中更常与 pay/leave/benefit 等搭配，illness 更中性、更常泛指持续或严重的健康问题。这里不比较 sickness 的另一义项“恶心、晕动症”（如 travel sickness、morning sickness）。

Compared meaning: the feeling of wanting to vomit (noun).

比较义项：恶心、想吐的感觉（名词）。

• sickness 本词

  Sickness is the everyday, more British way to name this feeling, often built into fixed phrases like morning sickness or travel sickness; it can also loosely suggest actual vomiting, not just the sensation.

  sickness是更日常、更英式的说法，常出现在表示“孕吐”或“晕车”的固定搭配中；它也可以宽泛地指代真正的呕吐，而不仅仅是想吐的感觉。

  Morning sickness kept her running to the bathroom every single day.

  孕吐让她每天都得往卫生间跑。

• nausea

  Nausea is the more formal, almost clinical term for wanting to vomit, typically uncountable and paired with words like wave or feeling; it rarely appears in fixed compounds such as morning sickness.

  nausea是更正式、接近医学用语的说法，表示想吐的感觉，通常作不可数名词，常与“一阵”或“一种感觉”等词搭配使用；它很少出现在类似“孕吐”那样的固定搭配中。

  A wave of nausea swept over him as the boat rocked violently.

  船剧烈摇晃时，一阵反胃感向他袭来。

Sickness and nausea both mean wanting to vomit, but differ in tone. Sickness is everyday and British, often in phrases like morning sickness. Nausea is more formal, almost clinical, usually uncountable, and often follows words like wave. Sickness's other meaning, illness, is not compared here.

在表示“恶心、想吐的感觉”时，sickness和nausea意思相近，但语域不同：sickness更口语化、更英式，常出现在“晨吐”“晕车”等固定说法里；nausea更正式，接近医学用语，常见搭配是“一阵nausea”。这里不涉及sickness表示“疾病”的其他义项。