Untreated high blood pressure, often asymptomatic, poses significant long-term risks to vital organs including the heart, brain, kidneys, and eyes. Dr. Prabhat Ranjan Sinha explains that the lack of immediate symptoms can lead to delayed diagnosis, allowing gradual damage. The heart must work harder, potentially leading to thickening and weakening, while damaged brain blood vessels increase stroke risk. Regular check-ups after age 30-35 are recommended to detect and manage hypertension early.