lessen

decrease in size, extent, or range; "The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fall to under a hundred pounds"; "his voice fell to a whisper"

कभी कभी लक्षणों को कम करना बहुत ही खतरनाक होता है।

Due to a massive campaign for polio drops the incidence of the disease has considerably lessened.