Children who later develop bipolar disorder often begin secondary school ahead of their brothers and sisters, only to lose that lead within a few years. The same genetic factors tied to the condition appear to support strong early learning, before emerging symptoms start to interfere with concentration, sleep and attendance. A sudden drop in marks around age 13 can therefore be more than a ordinary teenage dip, and may be one of the first outward signs that support is needed.
Researchers set out to explain a long standing contradiction. Adults with bipolar disorder tend to finish with fewer qualifications than their peers, yet genetic studies have repeatedly found a positive link between liability for the condition and educational attainment. The work tested whether high genetic risk for bipolar disorder travels with high genetic potential for education, and whether the illness itself then knocks that trajectory off course.
The analysis, published in European Neuropsychopharmacology, used sibling comparisons in large Norwegian and British datasets. Because brothers and sisters share half their DNA and much of their home environment, differences within a family are harder to explain by upbringing or income alone. Polygenic scores for bipolar disorder were compared with educational attainment in the Norwegian Mother, Father and Child Cohort Study and in UK Biobank.
In Norway the within family association was positive. Siblings with a higher genetic score for bipolar disorder also tended to reach slightly higher levels of education, with an estimate of 0.03 across more than 37,000 people. In the British data the between family link was positive and statistically significant, while the within family link pointed the same way but did not reach significance.
School records from Norwegian national registries made the age pattern clearer. Young people later diagnosed with bipolar disorder performed better than their healthy siblings at age 10, with a hazard ratio of 1.15 in a sample of more than 600,000. By age 13 the advantage had reversed, and the same pupils were doing worse than their siblings, with a hazard ratio of 0.87. The gap remained at age 14. The authors link the change to prodromal symptoms that can disrupt learning well before a formal diagnosis.
Taken together, the genetic scores and the school records point to a shared liability between bipolar disorder and education. Early academic strength is real, and so is the later disruption that appears around the start of the teenage years. Timely recognition of that shift matters for qualifications as well as for health. Watching educational performance in this window may give families, teachers and clinicians a practical signal to act before opportunities narrow.
