HR can be a difficult profession, but extremely rewarding because of the way HR professionals are able to impact and assist employees. However, HR is highly influenced by the organization as a whole and can be very hard when working for a company that has poor culture or poor management. I would see this being a major reason that someone would want to leave the HR field, as it is certainly a struggle to support employees when you disagree with the way the company operates and the policies they push. That said, working in HR for a great company can incredibly rewarding. Not to say that it's not difficult, but having the support of your organization and being able to help people the way that you would like to makes it "easier" in a sense and definitely more enjoyable! If you're interested in pursuing a job in HR, I highly recommend doing extensive research on the companies you apply for (which you should do in any case), and even reaching out to folks on the HR teams of those companies to inquire about the culture in order to try to get a sense of whether they are happy in an HR role at that particular company!