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 

Stress can improve memory and focus under special conditions such as studying and  for an exam.

Skidmore College

Stress hormones can cause memory disorders and atrophy of the hippocampus which is associated with memory disorders

Memory Disorders and Stress 

Yaribeygi, H., Panahi, Y., Sahraei, H., Johnston, T. P., & Sahebkar, A. (2017). The impact of stress on body function: A review. EXCLI journal, 16, 1057–1072. https://doi.org/10.17179/excli2017-480

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