Stress is an issue that most people face on a daily basis. Conversations and research around stress have increased in the past few years, especially with the onset of the Covid-19 pandemic. This review examines and categorizes research that has been conducted regarding stress into three main categories: (1) Covid-19; (2) Mathematical Models and Machine Learning; and (3) Surveys and Review Papers. The purpose of this review was to investigate stress factors that have been studied or modeled since this has become a prevalent issue in society. Summary tables that are split into five main stress categories are included: (1) Covid-19 Factors; (2) Social Factors; (3) Academic Factors; (4) Environmental Factors; and (5) Personal Factors. Some takeaways from this review are that there are many factors that contribute to stress of an individual and these factors can fall into multiple categories.