Hundreds of medical personnel from First People's Hospital in Wenling city of Zhejiang province gathered to call for an end to violence against doctors, Oct 28, 2013. [Photo / icpress.cn]

According to a police investigation into the attack at Longmen, Liao went to the doctors' office at Longmen hospital to look for Dr. Ou, who had been his doctor, on Wednesday to inquire about his headaches. Ou asked him to go to the outpatient department as she was not on duty at the clinic that day.

Liao became agitated and took out a knife from his bag. Ou was injured on her right hand and left arm before Liao was stopped by others.

Liao said he harbored hatred for the doctor because he believed medicine prescribed by Ou was to blame for his chronic headaches.

Tian Wuhan, director of the Guangdong Medical Association, said frequent hospital violence has not only inflicted physical injuries and psychological trauma on medical workers, but also damaged the relationship between doctors and patients. In June alone, 12 cases of violent attacks on medical workers occurred in hospitals nationwide.

In a poll published in May by the Chinese Medical Doctor Association, some 13 percent of 12,600 doctors said they had been physically assaulted by their patients last year, and nearly 60 percent had been verbally abused. Doctors said they felt they were not respected and their personal security was not protected in the workplace.