Hypertension can be caused by a million different reasons and even then in my experiences 140/90 isn't outrageously high - common things include time of day, position, diet (coffee and sodium/salt intake), stress level, sleep patterns and instrumentation as well.
I wouldn't lose any sleep over it, if you haven't had an annual checkup book one and just ask the doctor, if they thorough I could see them ordering a lipid panel but given your age and weight I wouldn't expect that to be abnormally high.
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