Early periods and depression studied - NHS.uk Girls who go through puberty early are more likely to suffer mental health problems in their teenage years, The Daily Telegraph reported. The newspaper suggested that these problems may be due to rows with parents and boyfriend troubles. What were the basic results? The researchers found that, compared to girls whose periods started between the ages of 11.5 and 13.5, girls who had their first period before the age of 11.5 had higher levels of depressive symptoms at the ages of 13 and 14 years. Longer-term follow-up from this ongoing study will determine these girls progress as they get older and could determine whether any of them develop a diagnosis of depression. Until this information is available, it is difficult to say whether targeted support for girls whose periods start early might be helpful to prevent them developing depression.