A new study has found that women who take birth control pills are more prone to depression. Researchers also discovered that teenagers on birth control pills face a greater risk, with as much as 80 percent prone to depression.

Danish researchers discovered that the most popular birth control pill choice, which is the combined oral contraceptive, can increase depression in women aged between 20 to 34. Up to 23 percent of these women interviewed admitted that they had been prescribed antidepressants. However, those who only use the progestin pill or the "mini pill" also shows an increased risk up to 34 percent.

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Teenage girls aged 15 to 19 are the ones who are the most vulnerable to depression, as those combined pill users have an 80 percent chance and a 120 percent chance for those who use the progestin pill.

In this new study, a team from the University of Copenhagen analyzed medical records of one million Danish women who fall between the ages of 15 to 34. They discovered that in a period of six years, 133,000 of these patients were prescribed antidepressants as 23,000 of them were clinically diagnosed with depression.

The teenage girls and women in this new study had no history of depression, before taking the pill.

According to the lead author of the study, Ojvind Lidegaard of the University of Copenhagen, further studies are needed to examine how depression is a potential adverse effect of the use of hormonal contraception.

Scientists have suggested that the progesterone hormone, which is the main component of most contraceptive pills and is also naturally produced in the body, is related to depression.

This new study has been published in the journal, JAMA Psychiatry.