Plain Language Summary Publication: Investigating the causal and genetic relationship between migraine and Parkinson’s disease

This study found no association between Parkinson's disease and migraine. There has been debate about whether headache conditions and Parkinson's disease are related. Some studies suggest that people who have migraine might have a higher risk of developing Parkinson's disease. However, other research shows that people with Parkinson's disease often have fewer of these headaches. These mixed results create uncertainty about whether there is a real connection between the two conditions. Knowing the truth can help improve how we prevent and treat both conditions. We obtained genetic data from large international studies on migraine and Parkinson's disease. We used Mendelian randomization, a method that utilizes genetic information to determine if one condition might cause the other. We also performed an extensive genetic analysis to find common genetic factors between the two conditions. Our analysis found no significant causal relationship between migraine and Parkinson's disease, even when looking at different types of headache or considering other health issues like heart disease and high blood pressure. The genetic analysis showed no shared genetic correlations between the two conditions. These findings suggest that migraine and Parkinson's disease are unlikely to be genetically connected. For researchers, this means future studies should explore other potential risk factors. For doctors, the results show that having these headaches does not increase the risk of developing Parkinson's disease, offering reassurance to patients. The study also highlights the value of advanced genetic methods in understanding complex disease relationships for more accurate and personalized care. Ming-Gang Deng, Xiuxiu Zhou, Fang Liu, Kai Wang, Lingli Luo, Min-Jie Zhang, Qianqian Feng, and Jiewei Liu declare no conflicts of interest.