A woman has undergone surgery after being stabbed in the stomach with a kitchen knife with a 30 centimetre blade in Sydney's south west, Parramatta bail court heard today.


Edward Joseph Murphy, 44, of Yeo Street, Yagoona was refused bail over the matter.


He was charged with reckless wounding over the incident, which occurred about 7.30pm on Friday at Yagoona.


The court heard the victim was Murphy's girlfriend and she was injured following a day of arguing with him.


Police papers tendered to the court also said both the victim and Murphy have mental health problems which require them to take medications including methadone and valium.


The court heard the victim sustained a one centimetre wide and three centimetre deep wound to her stomach after a fight which started after Murphy accused her of hiding his methadone.


Murphy applied for bail and told the court he did not attack the victim and her injuries were self inflicted.


Magistrate Les Brennan said he refused bail due to the seriousness of the victim's injuries.


She was taken to Liverpool Hospital and is in a stable condition after undergoing surgery.


Murphy will face Bankstown Local Court on May 15.