Abortion
A study done in New Zealand in 2006 showed that many women who had an abortion developed severe depression up to 4 years after they had the abortion. They were also more likely to have problems with alcohol and illegal drugs than those women who did not have an abortion. The person who oversaw the study later told media that given these results it would be very hard to say that having an abortion has no psychological effects on the woman who has it. He called the abortion "a traumatic experience".