Saïdeh (Arezu) Khadir was born in Tehran in 1970. At the age of five, her family migrated to Montreal in 1975, where she received her primary and secondary education. Subsequently, she was admitted to the University of Montreal medical school, where she graduated and obtained her specialization in Family Medicine in 1998.

Ms. Khadir has been interested in social and political issues since her university days, during which she volunteered to spend a stage period in Bolivia, assisting homeless and underprivileged young people. Following her graduation, she became a founding board member of the Québec Physicians for Medicare (MQRP) and a board member of Canadian Doctors for Medicare. Since then, she has remained actively engaged in numerous social and political activities, participating in various organizations, such as Physicians for Global Survival (PGS), Collectif Échec à la guerre, and Mouvement Québécois pour la Paix, while concurrently practicing Family Medicine.

Ms. Khadir's involvement with the Iranian community dates back to 1998 when she became an active member of the Iranian Center for Cultural and Social Collaboration. In 2016, she became involved with Norouz Land, a social and cultural organization dedicated to encouraging peace and cultural collaborations between the countries that celebrate Norouz as their official new year. From 2016 until the present, she has been involved with the Iranian Canadian Congress (ICC), with her main objective being to promote peace and prosperity for her motherland and to encourage peaceful transformations in Iran while respecting the integrity of Iran and the rights of its citizens. She once stated, "Deep in my heart, there has always been a special place for my country of origin and the Iranian community here in Canada."