Mycoplasma genitalium, a sexually transmitted disease-causing bacterium, is known by many other names and synonyms. It is commonly referred to as MG or Mgen. Other synonyms for mycoplasma genitalium include Ureaplasma genitalium, M. hominis, T-strain mycoplasma, and Mycoplasma sp. strain S104. These names all refer to the same bacterium that can cause a number of symptoms including urethritis, cervicitis, and pelvic inflammatory disease. While mycoplasma genitalium is often difficult to detect and treat, being aware of the various synonyms can help medical professionals identify and diagnose it more effectively. By understanding the many names and aliases of this bacterium, healthcare providers can ensure prompt treatment and management, reducing the potential risks and long-term complications associated with this sexually transmitted disease.