It might indicate that your blood pressure medication is working too well, or that your heart is not pumping very well, or that your bp monitor is not working correctly, or that you are not taking your blood pressure correctly, or that you are having some kind of glandular dysfunction, or that you have a severe infection, or that you are badly dehydrated, or that you are having a severe allergic reaction.
Perhaps others more knowledgeable than me can chime in with some other plausible causes?
Anything fit? Low Diastolic is also possibly if you are pregnant, but, being male, I don't think that you are worried about this being the case.
Normally, Diastolic Blood Pressure's lower range is still healthy no less than 55 mm Hg.
Blood Pressure, in my unprofessional opinion, is just a number that reflects what is going on in one's body. In order to learn exactly what it means, a doctor, or other health professional, would have to fully evaluate someone's daily blood pressure patterns over an extended period of time, Dietary requirements, current Exercise regime, Immune System Functioning and Neuro-Hormonal Imbalance, and then prescribe corrective medication, and recommend environmental, dietary and lifestyle changes.
When was the last time that you had a CBC (Complete Blood Count), which can be helpful in evaluating the overall health of one's body.