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

Stress and Memory Causing Positive Effects

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

Skidmore College

Chronic stress may result in atrophy of the brain mass as well as decrease its weight. These differences in cognition, memory and stress. 

Brain 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

The impact of stress on body function: A review

Memory Disorders and Stress 

Individuals under stress are most likely to suffer from frequent illness due to an impaired immune system. 

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