Well, my sister told me that she wanted to do med because she wanted to be in a career where she got to help people. She wants to become a doctor so she has the opportunity to offer voluntary medical aid to the many disadvantaged people back in my parents' home country.
I guess, she was influenced by my parents when she was young (eg: they would always tell her that when she grew up, she would become a doctor)...and yeah, now she wants to do med (or anything in the medical field, for that matter).
And my parents...yeah, they see medicine as being a prestigious degree which hence leads to a prestigious career which could be viewed as "heroic" by others (and yeah, i bet my parents want my sister to become a doctor so they have something to brag about to their friends (most of their friends, by the way have children that have become doctors..)).