According to research presented at the American Academy of Neurology's, depression might be an early symptom of Parkinson's disease.

The study presented on 59th Annual Meeting in Boston tried to estimate whether the probability to have Parkinson's disease was higher among people who were taking antidepressant medications than in people who were not taking these medications. They considered people who developed and was diagnosed Parkinson's disease and looked if they were taking antidepressant medications. It appeared that people who were taking antidepressants were nearly twice as likely to develop Parkinson's disease as those who were not taking antidepressants.

Certainly this cannot be interpreted as statistical evidence that antidepressants cause Parkinson's disease," said Miguel Hernan, MD, DrPH, of Harvard School of Public Health in Boston. However, though the relationship is only apparent, the suggestion that depression is an early symptom of the disease exists and should be studied more.

To hold this study, researchers learned a database of three million people in the UK and identified 1,052 people with Parkinson's disease. After this they matched them with 6,634 people without Parkinson's disease and looked at antidepressant medical history before the diagnosis of Parkinson's disease. It appeared that the risk of development of Parkinson's disease was the same for both men and women across all age groups. Also scientists emphasized that the disease didn't depend from the type of antidepressants patients took.

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