What are the experiences in the first days following in vitro fertilization (IVF), and what is the pathophysiology of ovarian hyperstimulation syndrome (OHSS)?

In the early days following IVF, patients may experience symptoms due to OHSS, which can vary from mild discomfort to severe clinical manifestations. The underlying pathophysiology involves increased ovarian response and vascular permeability driven by fertility treatments and hormonal mediators.