addiction; being hooked on; being absorbed in
Describes a strong habit or obsession, often with a nuance of being unable to stop. Commonly used in the phrase 病みつきになる (to become addicted/hooked).
This game is really addictive.
He got hooked on gambling and ended up in serious trouble.
falling ill; becoming sick
Literally 'becoming ill.' This sense is less common in modern Japanese and is often replaced by 病気になる. It may appear in older or literary contexts.
After falling ill, he became noticeably thin.