～熱 en 30 segundos
- Used for medical fevers like 'high fever' (高熱).
- Describes social trends or crazes (e.g., soccer fever).
- Indicates personal passion or dedication to a task.
- Pairs with verbs like 'rise' (高まる) or 'cool' (冷める).
The suffix ～熱 (ねつ - netsu) is a versatile linguistic component in Japanese that primarily functions in two distinct domains: medical conditions involving body temperature and social or psychological states of intense enthusiasm or craze. At its core, it represents 'heat' or 'fever'. When attached to a noun, it characterizes the nature of that heat or the specific object of one's passion. This dual nature makes it a crucial suffix for intermediate learners (CEFR B1) to master, as it bridges the gap between basic physical descriptions and more abstract social commentary.
- Physical Fever
- Refers to an elevation in body temperature. Examples include 高熱 (こうねつ - high fever) and 微熱 (びねつ - slight fever). It describes the intensity or the state of the illness.
- Social Craze
- Refers to a surge in popularity or a collective obsession with a specific topic. Examples include 投資熱 (とうしねつ - investment fever) or 日本食熱 (にほんしょくねつ - Japanese food craze).
- Personal Passion
- Describes an individual's intense interest or dedication. 研究熱 (けんきゅうねつ - passion for research) or 教育熱 (きょういくねつ - enthusiasm for education) are common examples.
「昨夜から高熱が出て、学校を休みました。」(I had a high fever since last night and stayed home from school.)
「最近、若者の間でキャンプ熱が高まっている。」(Recently, the camping craze is rising among young people.)
Understanding the nuance of ～熱 allows you to express not just facts, but the intensity of a situation. Whether you are at a doctor's office describing a 微熱 (slight fever) or at a business meeting discussing the 投資熱 (investment craze), this suffix provides the necessary descriptive weight. It is one of the most productive suffixes in the Japanese language for creating compound nouns that describe 'states of intensity'.
Using ～熱 correctly requires understanding its placement as a suffix. It is almost exclusively attached to nouns to form a new compound noun. The resulting word functions as a single noun in a sentence.
Grammatical Structure
- [Noun] + 熱
- Example: サッカー (Soccer) + 熱 = サッカー熱 (Soccer fever/enthusiasm)
- Example: 高 (High) + 熱 = 高熱 (High fever)
Verb Pairings
- ～熱がある: To have a fever (medical)
- ～熱が高まる: Enthusiasm is rising
- ～熱が冷める: Enthusiasm is cooling down
- ～熱を上げる: To become obsessed (colloquial)
Common Adjectives
- 激しい～熱: Intense craze
- 一時的な～熱: Temporary fad
- 根強い～熱: Deep-rooted passion
- 異常な～熱: Abnormal fever/craze
「彼は仕事に対する情熱がすごいが、時々微熱を出して倒れる。」(He has great passion for work, but sometimes he collapses with a slight fever.)
In medical contexts, the suffix is often preceded by a descriptor of the degree (High, Slight, Normal). In social contexts, it is preceded by the object of interest. Note that while 熱 (netsu) can stand alone to mean 'fever' or 'heat', the suffix form ～熱 creates a specific category of that heat.
You will encounter ～熱 in a variety of settings, ranging from the very formal to the quite casual. Its versatility makes it a staple of Japanese daily communication.
- At the Hospital / Pharmacy
- Doctors will ask if you have 高熱 (high fever). You might report a 微熱 (slight fever) that won't go away. This is the most literal and common use.
- News and Business Reports
- Journalists often use ～熱 to describe market trends. "The 不動産熱 (real estate fever) in Tokyo is cooling down" or "The AI熱 (AI craze) is reaching new heights."
- Pop Culture and Hobbies
- Fans might talk about their 推し熱 (passion for their favorite idol). It describes a state of being 'fired up' about a hobby or person.
「今回のオリンピックで、国民のスポーツ熱が一気に高まった。」(With this Olympics, the public's sports fever rose all at once.)
While ～熱 is productive, it cannot be attached to every noun. Understanding its limitations is key to sounding natural.
- ✗
Overusing with Emotions: Don't use it for simple emotions like 'sadness' or 'happiness'. You cannot say 悲しみ熱. It must represent an active, 'hot' state like passion or obsession.
- ✗
Confusing with 'Fever' as a Disease: While ～熱 is used for 'fever' (the symptom), it is also used in the names of specific diseases like デング熱 (Dengue fever). However, you cannot just add it to any illness. You don't say 風邪熱 for a cold fever; you just say 風邪で熱がある.
- ✗
Mixing with 'Atsui': Beginners often confuse the noun 熱 (netsu) with the adjective 暑い/熱い (atsui). Remember that ～熱 is a noun suffix. You cannot say サッカー熱い to mean soccer fever; it must be サッカー熱.
「彼は日本アニメに熱いです。」(Wrong) → 「彼は日本アニメに熱中しています。」 or 「彼のアニメ熱はすごいです。」(Correct)
Japanese has several ways to express passion and heat. Knowing the difference between ～熱 and its synonyms will elevate your Japanese.
- 情熱 (じょうねつ - Jounetsu)
- This means 'passion' in a more abstract, internal sense. It's a standalone noun. ～熱 is more about the 'feverish' outward manifestation or a specific trend.
- 熱中 (ねっちゅう - Netchuu)
- A Suru-verb meaning 'to be absorbed in'. While ～熱 describes the state, 熱中 describes the action of focusing intensely on something.
- ブーム (Boom)
- A loanword for 'boom' or 'fad'. It is synonymous with the social aspect of ～熱 (e.g., タピオカブーム vs タピオカ熱). ～熱 sounds slightly more literary or descriptive of the collective psychological state.
「仕事への情熱はあるが、今の起業熱にはついていけない。」(I have passion for work, but I can't keep up with the current entrepreneurship fever.)
In summary, use 情熱 for the fire in your heart, 熱中 for the act of being busy with a hobby, and ～熱 for the feverish state of a trend or a medical condition.
How Formal Is It?
Nivel de dificultad
Gramática que debes saber
Suffix compounding
Potential form (for 'sameru')
Transitive/Intransitive pairs (agaru/ageru)
Ejemplos por nivel
熱があります。
I have a fever.
Basic 'Noun + ga arimasu' structure.
熱は何度ですか？
What is your temperature?
Using 'nando' to ask for degrees.
昨日、熱が出ました。
I had a fever yesterday.
The verb 'deru' is used when a fever appears.
熱いお茶を飲みます。
I drink hot tea.
Note: This is the adjective 'atsui', not the noun 'netsu'.
熱が下がりました。
The fever went down.
The verb 'sagaru' means to go down.
子供が熱です。
The child has a fever.
Simple 'Noun desu' to state a condition.
熱を測ってください。
Please take your temperature.
The verb 'hakaru' means to measure.
熱で頭が痛いです。
My head hurts because of the fever.
The particle 'de' indicates the cause.
高熱が出て、入院しました。
I had a high fever and was hospitalized.
高熱 (kounetsu) = High fever.
少し微熱があります。
I have a slight fever.
微熱 (binetsu) = Slight/low-grade fever.
私の平熱は36度5分です。
My normal temperature is 36.5 degrees.
平熱 (heinetsu) = Normal body temperature.
熱が全然下がりません。
The fever won't go down at all.
Zenzen + negative verb.
インフルエンザで高熱が出た。
I got a high fever due to the flu.
Cause (flu) + de + result (high fever).
熱が引くまで寝ていてください。
Please stay in bed until the fever subsides.
Hiku (to recede) is used for fevers.
急に熱が上がってきた。
The fever suddenly started rising.
Agaru (to rise) + te-form + kuru (directional change).
熱っぽいので、早く帰ります。
I feel feverish, so I'm going home early.
Netsuppoi = feverish (suffix -ppoi).
最近、キャンプ熱が高まっている。
Recently, the camping craze is rising.
Metaphorical use for a trend.
彼女は教育熱心な母親だ。
She is an education-minded mother.
教育熱心 (kyouiku nesshin) = enthusiastic about education.
新しい趣味への熱がすぐに冷めてしまった。
My enthusiasm for my new hobby cooled down quickly.
Netsu ga sameru = to lose interest.
日本のアニメ熱は世界中に広がっている。
The anime craze is spreading all over the world.
Social 'fever' as a global trend.
彼は投資熱に浮かされている。
He is carried away by the investment fever.
Netsu ni ukasareru = to be delirious/carried away by a craze.
あの歌手に対する熱はもう冷めた。
My passion for that singer has already cooled.
Netsu ga sameru = loss of fan enthusiasm.
仕事熱心なのは良いが、体も大切に。
Being hardworking is good, but take care of your body too.
仕事熱心 (shigoto nesshin) = hardworking/dedicated.
再開発で、この街の不動産熱がすごい。
Due to redevelopment, the real estate fever in this town is incredible.
Economic 'fever'.
バブル期の土地投機熱は異常だった。
The land speculation fever during the bubble era was abnormal.
Historical economic context.
彼は研究熱心なあまり、昼食を忘れることもある。
He is so dedicated to his research that he sometimes forgets lunch.
～あまり (amari) = so much that...
一時のブームに終わらず、根強いサウナ熱が続いている。
It didn't end as a temporary boom; the deep-rooted sauna craze continues.
根強い (neduyoi) = deep-rooted.
海外進出への熱が冷めやらぬうちに、契約を結ぶ。
Sign the contract while the enthusiasm for overseas expansion hasn't cooled yet.
冷めやらぬ (same-yaranu) = hasn't cooled yet (literary).
若者の選挙に対する政治熱をどう高めるかが課題だ。
The challenge is how to increase the political enthusiasm of young people for elections.
Political context.
彼女は今、韓国ドラマに熱を上げている。
She is currently obsessed with Korean dramas.
熱を上げる (netsu o ageru) = to be obsessed/crazy about.
過熱する中学受験熱に、警鐘を鳴らす専門家もいる。
Some experts are sounding the alarm about the overheating middle school entrance exam fever.
過熱 (kanetsu) = overheating.
その土地には、かつてのゴールドラッシュの熱気が残っていた。
The excitement of the former gold rush remained in that land.
熱気 (nekki) = hot air / excitement.
明治維新後、日本には欧米文化への心酔熱が吹き荒れた。
After the Meiji Restoration, a fever for idolizing Western culture swept through Japan.
Historical/Literary use.
市場の過度な期待熱が、株価の暴落を招いた。
The market's excessive fever of expectation led to the stock market crash.
Economic analysis.
宗教的な狂信熱は、時に社会的な混乱を引き起こす。
Religious fanatical fever sometimes causes social turmoil.
Sociological context.
作家は、創作熱に突き動かされるようにペンを走らせた。
The author moved the pen as if driven by a creative fever.
Creative/Artistic context.
ナショナリズムの熱が国民の間で静かに、しかし確実に高まっている。
The fever of nationalism is quietly but surely rising among the citizens.
Political science context.
その議論は、真理の探究というよりは、単なる論争熱の産物だった。
That discussion was more a product of a mere passion for arguing than a search for truth.
Philosophical nuance.
かつての革命熱も、今や歴史の一ページに過ぎない。
The revolutionary fever of the past is now nothing more than a page in history.
Reflective/Historical tone.
彼女の慈善活動に対する熱は、単なる同情を超えたものだった。
Her passion for charitable activities went beyond mere sympathy.
Character description.
大衆の熱狂熱を煽るような扇動的な言辞が目立つ。
Incendiary rhetoric that fans the flames of the masses' fanatical fever is prominent.
Critique of political discourse.
その詩には、若き日の焦燥熱が色濃く反映されている。
The poem deeply reflects the fever of youthful impatience.
Literary criticism.
科学の進歩がもたらす万能感への過信熱を、著者は批判している。
The author criticizes the overconfident fever toward the sense of omnipotence brought by scientific progress.
Academic critique.
伝統回帰の熱が、現代建築のデザインに新たな息吹を与えている。
The fever for returning to tradition is giving new life to modern architectural design.
Architectural/Cultural analysis.
情報の洪水の中で、真実を見極めるための冷静な思考が、熱に浮かされた社会には欠けている。
In a flood of information, the feverish society lacks the calm thinking necessary to discern the truth.
Social commentary.
彼は、自らの内に秘めた復讐熱を、長い年月をかけて静かに燃やし続けた。
He kept the hidden fever of revenge burning quietly within him over many years.
Narrative/Psychological depth.
バブル崩壊後の虚脱感は、それまでの過剰な消費熱の反動であった。
The sense of lethargy after the bubble burst was a reaction to the excessive consumption fever until then.
Economic history.
形而上学的な問いに対する探究熱は、人類の歴史とともに歩んできた。
The fever of inquiry into metaphysical questions has walked alongside human history.
Philosophical breadth.
Colocaciones comunes
Frases Comunes
Se confunde a menudo con
Modismos y expresiones
Fácil de confundir
Patrones de oraciones
Cómo usarlo
Used for symptoms.
Used for trends and passions.
- Using 'netsu' for weather heat.
- Saying 'netsu ga takai' when you mean 'atsui' (hot to touch).
- Adding 'no' between the noun and 'netsu' (e.g., サッカーの熱).
- Confusing 'netsu' (noun) with 'atsui' (adjective).
- Using 'netsu' for sadness or other 'cold' emotions.
Consejos
Medical Accuracy
Always specify 'kounetsu' or 'binetsu' to be clearer to a doctor.
Trend Spotting
Use '～netsu' when talking about what's popular on social media.
Suffix Power
Remember it attaches directly to the noun without 'no'.
Compound Words
Learn 'nesshin' (enthusiastic) alongside 'netsu'.
Natural Phrasing
Say 'netsu ga deta' instead of 'netsu o motta' for 'got a fever'.
Kanji Practice
The 'fire' radical at the bottom is key to remembering the meaning.
Education Fever
Understand 'kyouiku-netsu' to understand Japanese society.
Context Clues
If you hear 'netsu' in a business meeting, it's likely about a trend.
Heat = Passion
Link the physical sensation of heat to the mental state of excitement.
Adjective vs Noun
Don't say 'netsu desu' for 'it is hot' (the weather).
Memorízalo
Origen de la palabra
Contexto cultural
Trends in Japan move very fast, so '～netsu' is a common word in marketing and news.
Japanese people often check their 'heinetsu' (normal temp) daily, especially in schools and offices.
Practica en la vida real
Contextos reales
Inicios de conversación
"最近、何か熱中していることはありますか？"
"日本で今、一番熱いブームは何ですか？"
"風邪をひいた時、最高で何度まで熱が出ましたか？"
"あなたの国では、どんな「～熱」が流行っていますか？"
"子供の頃、何に熱を上げていましたか？"
Temas para diario
私の最近の趣味熱について書く。
子供の頃の教育熱心な先生について。
病気で高熱が出た時の思い出。
社会で過熱しているトレンドに対する私の意見。
情熱を持って取り組んでいること。
Preguntas frecuentes
10 preguntasYes, but it sounds like a craze or a trend. For a long-term hobby, 'shumi' is more common.
Usually, yes, as it indicates illness, but 'heinetsu' (normal temp) is neutral.
'Netsu' is often a specific craze; 'jounetsu' is deep, internal passion.
'Netsu ga arimasu' is the most common way.
No, use 'atsusa' or 'mousho' for heat in the weather.
It can be, like being 'head over heels' for someone.
It means the fever is going away or subsiding.
Usually not, it's just a 'slight' fever.
Yes, if there is a sudden craze for coffee in society.
'Netsu wa nando desu ka?'
Ponte a prueba 180 preguntas
/ 180 correct
Perfect score!
Summary
～熱 is a versatile suffix that bridges physical health and social passion. Whether you're sick or obsessed with a hobby, this 'heat' defines the intensity of your state.
- Used for medical fevers like 'high fever' (高熱).
- Describes social trends or crazes (e.g., soccer fever).
- Indicates personal passion or dedication to a task.
- Pairs with verbs like 'rise' (高まる) or 'cool' (冷める).
Medical Accuracy
Always specify 'kounetsu' or 'binetsu' to be clearer to a doctor.
Trend Spotting
Use '～netsu' when talking about what's popular on social media.
Suffix Power
Remember it attaches directly to the noun without 'no'.
Compound Words
Learn 'nesshin' (enthusiastic) alongside 'netsu'.
Ejemplo
子供が高熱を出したので、医者を呼んだ。
Contenido relacionado
Esta palabra en otros idiomas
Más palabras de health
しばらく
B1Por un tiempo, un rato.
異変がある
B1Hay un cambio inusual o una anomalía. Algo no está bien. (Hay una anormalidad.)
異常な
B1Anormal; inusual. Describe algo que se desvía de la norma de una manera preocupante.
擦り傷
B1Un rasguño o raspadura en la piel. Ocurre comúnmente al caerse o rozar una superficie rugosa.
吸収する
B1La esponja absorbe el agua rápidamente.
禁酒
B1Abstinencia de alcohol. 'Durante el embarazo, la kinshu es obligatoria.'
痛む
A2to hurt; to ache
鍼灸
B1La acupuntura y la moxibustión se utilizan para equilibrar la energía del cuerpo.
急性的
B1Significa 'agudo'. Se usa para describir una enfermedad o crisis que aparece de forma repentina e intensa.
急性な
B1Acute
