headache

to love dearly; to feel sorry for sb; to regret; to grudge; to be distressed

to favor a junior; to show favoritism to some juniors

(coll.) very painful

stomachache

(slang) ball-breaking; pain in the ass

(of muscles) to ache; sore

burning pain

to forget past pains once the wound has healed (idiom)

lit. the child sells the father's farm without regret (idiom); fig. to sell one's inheritance without a second thought for how hard one's forebears worked for it

(saying) it's all very well to talk, but getting things done is another matter; (fig.) to be an armchair expert; to blabber on