Occurs when a person experiences any physiological and/or psychological demand that causes a person to have to adjust to that demand, physiologically or psychologically.

The answer is stress.

Explanation:

Although there are many different causes for stress, studies have found that feeling pressured to comply in professional or academic tasks is one of the most common. It's also possible to feel stressed when, for example, a person needs to lose weight but is failing to see results (physiological demand).

Stress is a normal and often useful part of life. When positive and short-term, it can help us focus on completing a task. On the other hand, when it's long-term, it can interfer with everyday activities.