UPDATE: Ms Mathias has now been found.
A 32-year-old woman from Caerphilly has been reported missing.
Lisa Mathias was last seen in Cardiff on the evening of Friday, July 28. She has not been since then and police are concerned for her wellbeing.
If anyone sees Lisa or has information about her whereabouts, they can call Gwent Police on 101 quoting log number 2 30/7/17.