Hormonal imbalances could definitely be an answer here...
My daughter-in-law deals with blood pressure swings because of heart issues.
Sometimes you just can't find a straight answer, though it's interesting how these fluctuations often pop up in middle-aged people who’ve recently dealt with a major career shift or a change in lifestyle—I wonder if that applies to your mother as well?
Hopefully she’s found a solid doctor who will run all the necessary tests and really dig into the details, but in the meantime, maybe consider this:
The golden rule with fluctuating blood pressure is that patients shouldn't try to manage it on their own. Since they have to deal with the risks of both high and low readings, managing it is incredibly tricky. There isn't a one-size-fits-all solution, as treatment has to be strictly personalized. Medication isn't taken constantly, but rather only when the pressure spikes or drops significantly, and even then, only under a doctor's guidance.
Standard lifestyle and dietary adjustments are non-negotiable. It's recommended to maintain a steady intake of fluids and salt—roughly 2 liters of water and about 2.4 grams of salt daily. Along with a diet rich in fresh fruits, vegetables, and fish, daily physical activity is advised, whether it's just a walk through the park or heading to the grocery store without using the car.
Just like with hypertension or hypotension, those struggling with variable pressure need regular check-ups with a physician. Ideally, this should happen at least once a week.
Because of that emphasized point, you unfortunately won't find any concrete answers here on the forum, since if someone suffering from this condition chimes in, what worked for them might actually be dangerous for someone else...
Wishing you and your mother the best... 😉