Final answer:
Negative or injurious stress is referred to as distress, which is harmful and impairs one's functioning and health, as opposed to eustress that can have a positive impact.
Step-by-step explanation:
Negative or injurious stress, which can make concentration difficult and have various negative health implications, is also called distress. Unlike eustress, which is a positive form of stress that can motivate individuals and enhance performance, distress occurs when stress exceeds an optimal level and begins to impair functioning. Distress can lead to feelings of being overwhelmed, exhaustion, and a decline in both performance and health.