Police are seeking urgent public assistance to help locate 52-year-old Ourania Vekios, who needs urgent medical treatment.

Ourania was last seen at around 4am this morning at Herston.

Police and medical staff hold serious concerns for her safety and welfare due to ongoing requirements for medical treatment.

Ourania is known to visit areas around North Brisbane, particularly Sandgate. Police believe she may be travelling on foot or public transport.

She is described as Caucasian in appearance, around 160cm tall with dark brown hair.

Anyone who sights Ourania or has any information on her whereabouts is urged not to approach her but call Triple Zero (000) immediately.