The man, who inflicted three cuts with a blunt kitchen knife, suffered from depression and sometimes felt neglected, his wife told Patong police and doctors.
Officers quickly reported the incident to Phuket Governor Maitree Intrusud. He has asked to be told about every incident in which expats and tourists are involved.
The man's wife told police that she arrived home at their Nanai district apartment about 7.30pm to find her husband slumped in the toilet, bleeding profusely.
They had been together for four years, she said. Her husband was a ''nice man'' but she had to give him warmth all the time to stave off noi jai, she said.
Photographs taken at the time showed the man sitting on the toilet in a pool of blood.
He was treated at Patong Hospital then transferred to Vachira Phuket Hospital in Phuket City, where he was admitted.
The man's wounds did not appear to be life-threatening. ''It's not the first time he has done this,'' she said. ''His time is spent trying to stay cheerful.''
Phuketwan has been given the 58-year-old man's name but is withholding it, to assist with his recovery.
People on Phuket suffering from depression are advised to talk to family or friends or discuss the issue with a doctor.