Concerns are held for the welfare of a heavily pregnant Brisbane woman who went missing on Monday night.

20 year old Shanaye Tyson was last seen about 11pm on Monday in the Brisbane CBD.

She is described as Aboriginal, 165cm tall with a solid build and long, partly shaven black hair.

She was last seen wearing dark blue Adidas shorts, a blue and grey jumper and thongs.

Anyone with information is urged to contact 000.