Blood Donation for High Blood Pressure
Doing good and benefiting from it yourself is easy for patients with high blood pressure by donating blood regularly. This benefits not only people who urgently depend on donated blood (whether due to illness or an accident), but also donors themselves if they suffer from excessively high blood pressure. In many cases, blood donation is also possible while taking blood-pressure-lowering medication. The physician at the donation site will determine whether blood donation is possible with the donor's current medication.
However, the blood-pressure-lowering effect in blood donors with hypertension is not merely short-term but sustained. In a study, Charité in Berlin observed a total of 300 blood donors. Half of them had high blood pressure, while the rest had normal blood pressure readings. They were observed over the course of up to four regular blood donations, equivalent to nine to twelve months.
The observed reduction in blood pressure among donors who started with moderate hypertension (grade II) could almost be described as dramatic. Systolic blood pressure decreased by 17.1 mmHg and diastolic blood pressure by 11.7 mmHg. Interestingly, the readings in the normotensive control group remained constant. Therefore, no one with normal blood pressure needs to worry that donating blood will cause their blood pressure to become too low.
The exact reason for this has not yet been conclusively established. However, there are various theories. For example, the reduction in iron levels caused by the donation could reduce oxidative stress on the blood vessels, helping them remain more elastic, which in turn benefits blood pressure regulation. Another theory suggests that blood donation lowers the levels of hormones and metabolites (metabolic products) that increase blood pressure, thereby also lowering blood pressure. However, since the „lost“ blood cells also need to be replaced, the lower blood pressure could also be related to this, because the newly formed blood components are more elastic and easier to deform. Less pressure may therefore be needed to pump them through the circulatory system.
But even people who do not donate blood regularly benefit if they have high blood pressure. The blood-pressure-lowering effect after a single blood donation lasts about six weeks.
Regular blood donation is particularly interesting for people with hypertension given that even a slight reduction in blood pressure of 2 to 3 mmHg can protect against potentially fatal cardiovascular diseases. The reduction in blood pressure achieved through regular blood donations is actually much greater and can sometimes even surpass the effects of drug therapy.
Regular blood donation also improved the donors' quality of life. Overall, they felt more capable, which may be due to an improved ability to neutralize free radicals. Or simply to knowing that they were doing something good.
However, there is an age limit for blood donors. Currently, first-time donors are eligible up to their 65th birthday. Experienced donors may donate blood up to their 73rd birthday. This limit serves solely to protect donors. The quality of the blood itself does not decline as the donor gets older.
If you have any questions about blood donation, you can find plenty of information and answers on the BRK blood donation service website at https://www.blutspendedienst.com/blutspende/spendeinfos/fragen-antworten#entry-17. Local blood donation appointments can be found, for example, on the DRK website: https://www.blutspende.de/
Sources:
This article is from Tensana – the leading app since 2011, helping hundreds of thousands of people monitor their blood pressure every day.
Our content is based on carefully researched, evidence-based data and is continuously updated (as of 12/2025).
Author Sabine Croci is a qualified medical assistant with many years of experience in internal medicine and cardiology practices as well as outpatient care, and has headed the specialist editorial team at Tensana since 2015. Thanks to her extensive additional qualifications as an emergency medical technician, first responder, and in various areas of therapy and emergency care, she provides well-founded, practical, and reliably verified information.
Author Sabine Croci is a qualified medical assistant with many years of experience in internal medicine and cardiology practices as well as outpatient care, and has headed the specialist editorial team at Tensana since 2015. Thanks to her extensive additional qualifications as an emergency medical technician, first responder, and in various areas of therapy and emergency care, she provides well-founded, practical, and reliably verified information.
