Your blood pressure should be 90/55. Your blood pressure is low. Normal systolic blood pressure is between 90 and 139, and diastolic blood pressure is between 60 and 89. Hypotension can be seen in normal people, old people with poor constitution, hypothyroidism, post-operative trauma, heart failure, etc. But if you don't feel dizzy or fatigue, you don't have to worry too much. Generally, thin people will appear 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.
At the same time, you can take high-quality protein, eat more fruits and vegetables, exercise properly to raise your blood pressure. If you feel dizzy, palpitation, etc., you need to go to a cardiology clinic immediately.