It is an attitude and coping response. It elicits a positive emotional reaction and benefits one’s overall wellbeing. 

Skidmore College

Stress on memory and it’s effects is dependent on time of exposure to the distressing stimulus. Memory could be better or worse. 

Stress Effects on Memory 

Sansone, R. A., & Sansone, L. A. (2010). Gratitude and well being: the benefits of appreciation. Psychiatry (Edgmont (Pa. : Township)), 7(11), 18–22.

When engaging with perceived stimuli, you undergo 
- Reception 
- Perception 

Stress can cause pathophysiologic changes. Such as changes in the brain that can manifest into behavioral, mood, and cognitive disorders.

Stress, both acute and chronic, have detrimental effects on the cardiovascular system.

Simple psychological interventions can enhance and improve gratitude and can be effective in clinical settings.

Appreciation of valuable objects, encounters, experiences, and people in your life.