On September 17, 1925, Kahlo and Alejandro Gómez Arias, a school friend with whom she was romantically involved, were traveling together on a bus when the vehicle collided with a streetcar. As a result of the collision, Kahlo was impaled by a steel handrail, which went into her hip and came out the other side. She suffered several serious injuries as a result, including fractures in her spine and pelvis.
After staying at the Red Cross Hospital in Mexico City for several weeks, Kahlo returned home to recuperate further. She began painting during her recovery and finished her first self-portrait the following year, which she gave to Gómez Arias.