患

to suffer (from illness) / to contract (a disease) / misfortune / trouble / danger / worry

to string together / to skewer / to connect wrongly / to gang up / to rove / string / bunch / skewer / classifier for things that are strung together, or in a bunch, or in a row: string of, bunch of, series of / to make a swift or abrupt linear movement (like a bead on an abacus) / to move across

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

packed with people / overcrowded / overpopulation

it will cause no end of trouble (idiom)

foreign aggression

internal trouble and outside aggression (idiom); in a mess both domestically and abroad

to go through thick and thin together (idiom)

doctor-patient

lit. to foster an ulcer and bequeath a calamity (idiom); tolerating budding evil can only lead to disaster / to cherish a viper in one's bosom

lit. to foster an ulcer and bequeath a calamity (idiom); tolerating budding evil can only lead to disaster / to cherish a viper in one's bosom

lit. to nurture a tiger invites calamity / fig. to indulge one's enemy is asking for trouble (idiom)

Rear a tiger and court disaster. (idiom); fig. if you're too lenient with sb, he will damage you later / to cherish a snake in one's bosom

do not worry about scarcity, but rather about uneven distribution (idiom, from Analects)

zoonosis

injured person