I get very low blood pressure frequently. 82/43. sometimes lower. what causes this? blood pressure readings taken by various doctors

Low BP Causes: 1. At your age it could be do to blocked artery in one arm. Measure BP in both arms at same time to see. 2. The dévice they are using is off. 3. Measures on arm or wrist? 4. If you have not symptoms then this may be normal for you. .5 If you have symptoms then consider not eating enough salt, meds you are on are lowering BP, 6. U have an auscultatory gap & 1 listening does not know how 2 avoid