noun, na-adjective, noun which may take the genitive case particle 'no'
prone to illness; sickly; often ill
Describes a person who tends to get sick frequently or has a weak constitution. Often used with ～の人 or as a な-adjective.
He has been prone to illness since childhood and often missed school.
People who are often ill should pay attention to their nutrition on a daily basis.
体が弱い means 'physically weak' in general, whereas 病気がち specifically emphasizes the tendency to catch illnesses.
Standard spelling using the suffix がち in kana.
Ateji spelling; rarely used and may be considered non-standard.
Compound of 病気 (illness) and the suffix がち, which indicates a tendency or proneness. The kanji spelling 勝ち is ateji and not etymologically related to the meaning.