The word(s) "burden" appears 30 time(s) in 28 verse(s) in Quran in Muhammad Pickthal translation.

(21) And no burdened soul can bear another's burden, and if one heavy laden crieth for (help with) his load, naught of it will be lifted even though he (unto whom he crieth) be of kin. Thou warnest only those who fear their Lord in secret, and have established worship. He who groweth (in goodness), groweth only for himself, (he cannot by his merit redeem others). Unto Allah is the journeying.

(22) Now when ye meet in battle those who disbelieve, then it is smiting of the necks until, when ye have routed them, then making fast of bonds; and afterward either grace or ransom till the war lay down its burdens. That (is the ordinance). And if Allah willed He could have punished them (without you) but (thus it is ordained) that He may try some of you by means of others. And those who are slain in the way of Allah, He rendereth not their actions vain.

(23) And if We would, We could show them unto thee (Muhammad) so that thou shouldst know them surely by their marks. And thou shalt know them by the burden of their talk. And Allah knoweth your deeds.

(24) And those that bear the burden (of the rain)

(25) And for such of your women as despair of menstruation, if ye doubt, their period (of waiting) shall be three months, along with those who have it not. And for those with child, their period shall be till they bring forth their burden. And whosoever keepeth his duty to Allah, He maketh his course easy for him.

(26) Lodge them where ye dwell, according to your wealth, and harass them not so as to straiten life for them. And if they are with child, then spend for them till they bring forth their burden. Then, if they give suck for you, give them their due payment and consult together in kindness; but if ye make difficulties for one another, then let some other woman give suck for him (the father of the child).

(27) And eased thee of the burden

(28) And Earth yieldeth up her burdens,