He is hospitalized with a serious illness.
Hand washing is important for disease prevention.
Figurative use: a personal flaw, bad habit, or moral weakness likened to an illness. Often used in self-deprecating or critical remarks.
His chronic lateness is a bad habit of his.
Gambling might be an incurable weakness.
noun which may take the genitive case particle 'no'
crazy; insane; sick in the head
Colloquial, often used in phrases like 病気じゃない？ to suggest someone is mentally unstable or acting irrationally. Can be light-hearted or derogatory depending on context.
Going for a run at this hour? Are you crazy?
That idea seems nothing short of insane.
The doctor cured his illness.
Shopping that much all the time—that's just crazy.
After taking the medicine, the illness went away.
He missed school because he was sick.
My grandfather passed away from an illness.
病気 means illness or sickness caused by disease, while 怪我 means injury caused by an accident or external cause; learners sometimes lump both together as 'being unwell'.
病気 refers to a specific illness or disease itself, while 病弱 describes a person's chronic tendency toward poor health.
病気 means the illness or sickness itself, whereas 病名 is only the formal name given to that illness.
get-well gift; get-well card; get-well letter · visit to a sick person; inquiry after a sick person
Katakana spelling; it is search-only. Occasionally used for stylistic effect.
Kyūjitai form; rarely encountered outside historical texts.