Domestic violence is often not looked for in mental health settings, nor examined in research into mental health issues.
From the limited studies, it would appear that the vast majority of people with severe mental illness have experienced either physical or sexual assault during their lifetime and this is often associated with a history of childhood abuse and substance misuse.
In the main, health professionals have not had specific undergraduate or postgraduate training on this issue, so it is no surprise that they feel ill-equipped to enquire about or respond to domestic violence. However, it is a sad reflection on the fields of psychiatry and other mental health professions that providers do not feel it is part of their role, when the association of abuse and violence and mental ill health is so strong. The over-reliance on medical, diagnostic and treatment models by mental health providers can result in social issues such as domestic violence being overlooked.
Domestic violence: the hidden epidemic associated with mental illness (abstract)