A new study out of Denmark, where abortion is legal until twelve weeks, finds there is no link between abortion and mental health issues. The study is in the New England Journal of Medicine. Here is an article from the LA times about it for those who just want the big picture, and here is the actual study, for those of you who like to go to the source. (You'll have to pay to see the whole thing or be subscriber.)
The conclusion as stated in the abstract is "The finding that the incidence rate of psychiatric contact was similar before and after a first-trimester abortion does not support the hypothesis that there is an increased risk of mental disorders after a first-trimester induced abortion." This finding is of particular importance to our friends in the US, whose legislators are increasingly demanding women seek counselling prior to abortions during which they are informed that they will suffer from "post abortion syndrome" and experience trauma, depression and perhaps, suicidal tendencies. It's baloney, bunk, hokum, twaddle, hooey, nonsense, and worst of all, scientifically unfounded.
For more on this, see my June 2010 post, "How do women feel after an abortion? Relieved."