When a person does it every day and looks for things to complain about. Like if you are living in a constant state of dissatisfaction or unhappiness, stress levels are higher. It also makes the highs of happiness or joy a lot higher, and coming down from those a lot harder. You may end up with things like anxiety or depression, or end up with physical stress issues like weight gain, poor sleep, high blood pressure, bowel and digestive issues, and so on. A person in a constant state of stress is not a healthy person, mentally, physically, or both.