A fluctuating BP is of two types: fluctuations on higher side and the other is fluctuations on the lower side. Fluctuations of BP on a higher side are mainly due to hormonal imbalance, kidney or heart problems. BP can also go to higher side after a physical activity like climbing stairs, running etc and this comes back to normal after rest. It can also be to due to anxiety and stress. Hence careful tests like kidney function test, stress test or treadmill test, ECHO, EKG, BP monitoring, and complete hormonal profile needs to be done. If the blood pressure is found to fluctuate during the day, then cortisol levels may also need to be checked. It is difficult to comment beyond this at this stage. Do consult your doctor to run tests to rule out these conditions. Take care!