Yeung studied at the Holy Family Canossian College in Kowloon and was a registered nurse at the Princess Margaret Hospital in Kwai Chung, Hong Kong.

She began her career as a singer and actress after coming third in the TVB 14th annual New Talent Singing Awards competition in 1995, co-organised with Capital Artists.

Many of her songs have been mainstream hits and award winners, such as "Maiden's Prayer" (少女的祈禱), "Sisters" (姊妹), "Unfortunately I'm an Aquarius" (可惜我是水瓶座) and "Small City, Big Things" (小城大事).

As an actress, Yeung has appeared in over 30 films with a total box office of around US$50 million worldwide, and had voice roles in three Korean and Thai movies.

She published "Miriam experience of school entry" in 1998, which encompasses short passages about her reflections on life, travel journals, and sharing with friends.