Well, I'm not sure I was asked. Google is your friend, although I suppose people will find what they want to find, like my quick search which found . .
A 1995 study by A.C. Gilchrist in the British Journal of Psychiatry found that in women with no history of psychiatric illness, the rate of deliberate self-harm was 70 percent higher after abortion than after childbirth.
A 1996 study in Finland by pro-choice researcher Mika Gissler in the British Medical Journal found that the suicide rate was nearly six times greater among women who aborted than among women who gave birth.
A 2002 record-linkage study of California Medicaid patients in the Southern Medical Journal, which controlled for prior mental illness, found that suicide risk was 154 percent higher among women who aborted than among those who delivered.
By 2003, the data was so compelling that a team of researchers published in the Obstetrical & Gynecological Survey (OGS), one of the top three obstetrical journals in the United States, identified a number of studies that found that “induced abortion increased … [the incidence] of mood disorders substantial enough to provoke attempts at self-harm” and concluded that, as a matter of medical ethics, “any woman contemplating an induced abortion should be cautioned about the mental health correlates of an increased risk of suicide or self-harm attempts as well as depression.”
A 2005 study by Mika Gissler in the European Journal of Public Health found that abortion was associated with a six-times-higher risk for suicide compared to birth.
A 2006 study by New Zealand researcher David M. Fergusson in the Journal of Child Psychology and Psychiatry, which controlled for a prior history of depression and anxiety and suicidal ideation (wanting to take one’s own life or thinking about suicide), found that 27 percent to 50 percent of women after abortion reported suicidal ideation. Mr. Fergusson found that the risk of suicide was three times greater for women who aborted than for women who delivered.
A 2010 study by Natalie P. Mota in the Canadian Journal of Psychiatry found that “abortion was associated with an increased likelihood of several mental disorders - mood disorders … substance abuse disorders … as well as suicidal ideation and suicide attempts.”
A 2011 meta-analysis in the British Journal of Psychiatry found an 81 percent increased risk of mental trauma after abortion.
Arguments as to whether or not abortion is detrimental to mental health notwithstanding, I've yet to see a study which claims that it is beneficial to those with mental health problems.