Police are appealing for help to find a 38-year-old missing woman from Mount Darragh, NSW, who is believed to be heading towards Canberra.

Kellie-Anne Levitski hasn't been seen since 8.30pm Sunday when she left her parents' home in Mount Darragh.

They couldn't find their daughter when they went to look for her the next day, and reported her missing.

Ms Levitski has been described as caucasian, 178cm tall, with a heavy build and long dyed-blonde hair.

She was last seen wearing a grey polar fleece top and a long black dress.

The missing woman has an ongoing medical condition that requires treatment and police said they were concerned for her welfare.

Police have asked anyone with any information to contact Crime Stoppers on 1800 333 000. Information can be provided