Police are asking for the public's help in finding missing Feilding woman Sali Tomai.

Police have concerns for the safety of a Feilding woman who hasn't been seen in two days.

Sali Tomai left St Dominic's Health Centre, where she lives, at some point on Tuesday and there has been no confirmed sightings of her since.

Tomai suffers from schizophrenia and bipolar and there are concerns about her welfare, police said.

She was described by a nurse at St Dominic's as being short, having short grey hair, and being very shy.

He said she may have difficulty approaching people and usually carried a back pack.

Police said she often walked into Feilding on Tuesdays to run errands, but she never returned from her latest trip.

There was a possible sighting of her at a Countdown in Palmerston North about 11am on Tuesday, so police believed she could be anywhere in the Palmerston North or Feilding area.

Staff at St Dominic's were worried about her.

"She usually goes to her daughter in Palmerston North, but she didn't go there," a nurse said.

Police are asking anyone who has seen Tomai or who may have information to call the Palmerston North police station on 06 351 3600 or anonymously through Crimestoppers on 0800 555 111.