http://travel.state.gov/visa/immigrants/info/info_3745.htmlunder MH it says
What if the applicant has a history of harmful or violent behavior?
Applicants with any history of harmful or violent behavior resulting in injury to people or animals, or harm to inanimate objects must provide information that will allow the panel physician to determine if the behavior was related to a psychiatric or medical problem, or to drug or alcohol use. Harmful behavior includes attempted suicide or self-harm, no matter how minor in nature.
What if the applicant has been treated or hospitalized for psychiatric or mental illness, or alcohol or drug abuse?
Applicants treated or hospitalized for psychiatric or mental illness or alcohol or drug abuse must present written certification including the diagnosis, duration of treatment rendered, and prognosis.
http://travel.state.gov/visa/immigrants/info/info_3745.html#_What_if_the_9