When someone is being harassed or criticized constantly, we often say "they're on one's case". This phrase implies that someone is being closely monitored, judged or criticized. Some of the synonyms of this phrase include: hounding, nagging, harassing, pressurizing and badgering. Other similar phrases that could be used to express this idea include "getting under someone's skin" or "riding someone". Such expressions imply that someone is causing annoyance and frustration to another person. Overall, it is important to be mindful of the feelings of others and avoid putting them under unnecessary pressure or criticism.