The Danish healthcare system is ideal for register-based studies since all Danish citizens have a permanent and unique personal ID number allowing for studies into risk factors, comorbidities and prescriptions. In this talk Dr. Maarbjerg will present novel results from disease trajectories studies showing which diseases are linked with TN before and after TN diagnosis. We will discuss the interpretation of these findings and what their importance is in the clinical approach to TN as well as regarding pathophysiology. We will also put this into perspective with other important aspects when deciding on TN medication and follow up.