My diastolic pressure is at 100 constantly now for over a year. it has been normal occasionally but mostly between 100-130. im a 20 year old female who eats healthy and exercises and is skinny (bmi is normal) what could be the cause of this?

Hypertension: "Differential Diagnosis of New-Onset Hypertension in a Young Woman - The most likely causes of secondary hypertension include primary aldosteronism, pheochromocytoma, Cushing syndrome, renovascular disease, hyperthyroidism, coarctation of the aorta, and drug-induced hypertension. " See: https://cjasn.asnjournals.org/content/13/6/929#:~:text=Differential%20Diagnosis%20of%20New%2DOnset,%2C%20and%20