Low blood pressure can happen for many different reasons, and knowing these factors can help you understand what might affect your readings.

Age can play a role. Older adults may notice drops in blood pressure when standing up or after meals. This may include orthostatic (postural) hypotension, which is a sudden drop in blood pressure when standing. It is especially common in older adults because changes in the body’s ability to regulate blood pressure can occur with age. Low blood pressure can also result from dehydration, when the body loses more fluid than it takes in. Low levels of certain nutrients—such as vitamin B-12, folate, or iron—can affect the body’s ability to make healthy red blood cells, leading to lower blood pressure.

Some medications may contribute to low blood pressure, including medicines used to treat high blood pressure and a number of other common prescriptions. Keeping track of your blood pressure readings each day can help you and your care team notice patterns and understand when your blood pressure tends to be low. If you believe your blood pressure is low because of a medication you’re taking, talk with your healthcare provider first before stopping or changing any medicine.

Certain health conditions can also be involved. Diseases like Parkinson’s, diabetes, and some heart conditions may lead to lower blood pressure. Alcohol use or the use of certain drugs can have a lowering effect as well. There are also medical conditions that can cause low blood pressure. Heart problems such as heart failure, heart valve issues, or a very slow heart rate can also cause blood pressure to drop.

Hormone-related conditions, like Addison’s disease or low blood sugar, may lower blood pressure, too. Blood loss from injuries or internal bleeding reduces the body’s blood volume, which can cause a significant drop. Severe infections or allergic reactions may also lead to sudden, dangerous drops in blood pressure.

Understanding these factors can help you recognize what may be affecting your blood pressure and support your overall health.

Reference:

Mayo Foundation for Medical Education and Research. (2024). Low blood pressure (hypotension). Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/low-blood-pressure/symptoms-causes/syc-20355465