What's your blood pressure?
Normal systolic blood pressure is between 90 and 139, and diastolic blood pressure is between 60 and 89. If your blood pressure is lower than 90/60, it is low blood pressure (hypotension).
Hypotension can be seen in normal individuals, the elderly with poor constitution, people with hypothyroidism, post-operative trauma, heart failure, etc.
If you don't feel dizzy or fatigue, you don't have to worry. Generally, underweight people will have low blood pressure. Sometimes, the incorrect use of a sphygmomanometer may make the measured blood pressure low. That blood pressure is not necessarily your real blood pressure. Hence, you should monitor your blood pressure multiple times or by ambulatory blood pressure monitoring.
Take high-quality protein, eat more fruits and vegetables, and exercise properly to raise your blood pressure. If you feel dizzy, palpitation, etc., you need to go to a cardiology clinic immediately.