发烧

Grammar-wise, 发烧 is a verb-object phrase, but you can treat it like a single verb. You’ll mostly see it paired with 了 at the end. Why? Because a fever is a change of state. You weren't hot, and now you are. So, 我发烧了 (I have a fever now) is your go-to sentence. You don't need to add the word 'have' (有). Just stick the person in front and you're done. If you want to say you've been feverish for two days, you'd say 发烧两天了. It’s simple, efficient, and lets you get back to napping faster.

Imagine you're watching a C-drama on Netflix. The main lead falls in the rain (as they always do). The next scene? They are in bed, and someone says 他发烧了. Or think about texting your boss on WeChat. You send: 老板，我发烧了，今天要请假 (Boss, I have a fever, I need to take the day off). It's the ultimate 'get out of work free' card. You’ll also hear it in pharmacies. You walk in, look miserable, and point to your head. The pharmacist will ask, 发烧了吗？ (Do you have a fever?). It's the bread and butter of daily health talk.

Use this anytime your body temperature is above the norm. It’s perfect for medical contexts, like talking to a school nurse or a doctor on a Zoom consultation. It’s also used when checking on friends. If someone looks flushed or lethargic, you can ask, 你是不是发烧了？ (Do you have a fever?). It shows you care. You can also use it slightly hyperbolically. If you've been working too hard and your brain feels like it's melting, you might say 我忙得要发烧了 (I'm so busy my head is about to catch fire). But mostly, keep it for the thermometer moments.

Don't use 发烧 when you just mean the weather is hot. If the sun is beating down on you in Shanghai, use 热. If you use 发烧, people will try to take you to the hospital. Also, don't use it to describe someone as 'hot' or attractive. Calling a celebrity 发烧 makes it sound like they need a COVID test, not a modeling contract. Use 火 (fire/trending) or 性感 (sexy) for that. Finally, don't use it for spicy food. If your mouth is burning from Sichuan peppers, that’s 辣, not a medical emergency.

In English, we say 'I have a fever.' In Chinese, adding 'have' (有) makes it sound clunky and non-native. Just let the 'emitting heat' do the work.

Weather doesn't get a fever unless the planet is really in trouble.

If the hotpot is 'emitting heat' like a human, you should probably call a priest, not a waiter.

You need that 'I' or a subject to ground the sentence. Otherwise, it's just a floating medical symptom.

If you're not quite at the fever stage but feel 'off,' use 难受. It means 'uncomfortable' or 'feeling bad.' If your head is just spinning, try 头晕. When you want to be more specific about the fever 'breaking,' the word is 退烧. It’s like the fire is retreating. Another one is 感冒, which is the common cold. Often, 发烧 is just a sidekick to 感冒. They’re the Batman and Robin of being sick. One brings the snot, the other brings the heat.

Want to sound more precise? Use 发高烧 for a high fever. It’s the difference between 'I feel warm' and 'You could fry an egg on my belly.' On the flip side, 发低烧 is a low-grade fever—the annoying kind where you aren't dying but you aren't 100% either. You might also hear 烧到39度 (burned to 39 degrees). Pro tip: China uses Celsius. If you say you 'burned to 102,' your Chinese friend will think you're already ash and dust.

Is 发烧 a noun or a verb? It’s technically a verb-object construction, but in a sentence, it acts like a verb. You don't need extra helping words. Does it only apply to humans? Mostly, yes. You can use it for pets too—我的狗发烧了. Can I use it for a computer? Funnily enough, if your laptop is overheating and about to explode while gaming, you can jokingly say 我的电脑发烧了. It’s a cute way to say it’s working way too hard. Is it formal? It’s neutral. You can say it to a toddler or the President of a company. Everyone understands the heat.