For years, doctors have noticed that women and men get sick differently. A new look at 1.14 million people with European ancestry reveals why. The genetic connection between ischaemic heart disease and depression is much stronger in women than in men. This difference helps explain why these conditions often appear together in female patients.
In women, the genetic overlap between these two illnesses is 43 percent. In men, that number drops to 21 percent. This means that for women, the genetic risk factors for heart disease and depression are deeply intertwined. For men, other factors play a bigger role in linking these conditions.
The study found that asthma and other female-specific health traits drive this link in women. In men, behaviors like alcohol use, poor sleep, and social isolation are the main drivers. These findings suggest that prevention strategies must change based on sex. Ignoring these differences could leave many patients without the right care.
Scientists caution that these results apply only to people with European ancestry. The biological reasons for these sex differences remain unclear. Still, this data offers a clear path forward for doctors to tailor their advice and treatment plans.