Aizawa was born in Mie Prefecture on September 10, 1980.

After graduating from high school, she joined Matsushita Electric Panasonic Bambina (later Speranza FC Takatsuki) in 1999.

In November 1999, when Aizawa was 19 years old, she was selected for the Japan national team for 1999 AFC Championship.

At this competition, on November 12, she debuted and scored 3 goals against Nepal.

This biographical article related to women's association football in Japan is a stub.