This study aims to evaluate the effects of lavender oil inhalation on anxiety, sleep quality, and blood pressure in patients with primary hypertension. It is designed as a double-blind randomized controlled trial. Patients presenting to the Cardiology Outpatient Clinic of Ardahan State Hospital will be recruited for the study. Participants will be randomly assigned to an experimental group, which will receive 12 lavender oil inhalations three times a week for one month, or to a control group, which will continue routine care. Data will be collected using the Hypertension Diagnostic Form, Beck Anxiety Inventory, and Pittsburgh Sleep Quality Index. The study will assess whether lavender oil inhalation affects anxiety, sleep quality, and blood pressure in this population. Statistical analyses will be conducted to compare outcomes between the experimental and control groups.