Blastocystosis has a global distribution and is recognized as one of the most common parasitic infections in humans. The prevalence varies across regions and populations, with higher rates reported in areas with poor sanitation and limited access to clean water. The parasite's ability to persist in the host for extended periods, even after treatment, raises questions about the nature of the host-parasite relationship and the potential impact on the gut microbiota. Research on Blastocystosis aims to unravel the complexities of host immune responses, the genetic diversity of Blastocystis hominis strains, and the factors influencing the variable clinical outcomes. The potential association between Blastocystis hominis and irritable bowel syndrome (IBS) has sparked interest in understanding the parasite's role in gastrointestinal health and disease. Advances in molecular techniques, such as DNA sequencing, have allowed for a more in-depth exploration of Blastocystis hominis subtypes and their potential implications for clinical manifestations. Ongoing investigations also focus on the development of more accurate diagnostic methods and alternative treatment approaches for blastocystosis. As our understanding of this parasitic infection continues to evolve, researchers strive to elucidate the factors influencing its pathogenicity and the broader impact on human health.