The COVID-19 pandemic: a special case of placebo and nocebo effects.

In late 2019, reports of pneumonia from an unknown cause marked the beginning of an unprecedented health crisis with far-reaching societal consequences. The ensuing global pandemic placed immense strain on healthcare systems, disrupted economies, and altered the way that we work, communicate, and interact. Importantly, as the SARS-Cov-2 (COVID-19) virus spread, so did a range of psychological stressors, including fear, anxiety, and uncertainty. This chapter examines the trajectory of placebo- and nocebo-relevant factors during the early, mid, and late stages of the pandemic, highlighting their impact on health outcomes and human behavior. Understanding the interplay between psychological and physical health during the pandemic is crucial for minimizing maladaptive health outcomes in the future. We therefore review current strategies for mitigating the nocebo effect and leveraging the placebo effect that may be employed to enhance health and well-being and attenuate pandemic-related harms.