It depends on the size of your firm. Typically, a human resource managers work in the least stressful ways compared with other departments such as sales and marketing. The most notable factor for me is that most of the firms have already outlined their HR policies such as compensation policies for employees, hiring and firing criteria, training and other popular areas in management. I don't call it a stressful task, but yes you have to be creative, diligent and forward-looking.

HR job is not an easy task. Everyone says HR job is slighty easy but nobody knows the real story. Companies expect HR to engage more with the existing employees but the back and forth hiring is not allowing them to do that effectively, Specially its a big problem for HR's of small companies who are single-handedly taking care of everything. 

People have a set notion that HR as a department has 'no work', let alone their job be stressful. The reason behind this is, probably, the fact that HR as a function is responsible for managing people and relationships in a work environment. Since we, humans, are 'social beings', we feel that managing people and relationships is something which doesn't need to be done by 'special people' in workplaces which is a myth. 

If you do work as formality then all job became the burden but you take it as responsibility and enjoy your job help you to get success in their profession. People have a set notion that HR as a department has 'no work', let alone their job be stressful. The reason behind this is, probably, the fact that HR as a function is responsible for managing people and relationships in a work environment. 

Job for human resource manager is a responsible job and as stress is concerned at any job ,level of stress is directly proportional to the work load ,and your interest in that job. What I observed is my HR manger loves her job,its her passion and she always finds a way to put loaded work in segments and deal with it smartly rather than thinking of work pressure. Stressors are born when you think negative about that particular thing. So,Just believe in yourself,create a strategy of dealing with loaded work ,think positive in your head and believe me your HR manager job will be fun

HR job is not that much stress. Recently I joined one company as HR by seeing job vacancy through the jobads site. In that company, work is not much more than my previous company. Stress will depend on the company but not by the designation.

It all depends on how you deal with the work. Other profession may be stressful if you don't know how to handle the responsibilities and work and all profession may become amazing if you know what to do and how to do. Human Resource Manager is surely a challenging job but not stressful and if you're feeling it as stressful then it is an indication that you need to do learn something new in that role.