Blood donation for high blood pressure
Doing good and benefiting yourself people with high blood pressure can achieve that easily by donating blood regularly. This helps not only those who urgently need donated blood (due to illness or an accident), but also the donor who suffers from high blood pressure. Donating blood is often possible even while taking blood-pressure-lowering medication. Whether a donation is possible with your current medication is decided by the donation physician on site.
The blood-pressure-lowering effect in donors with hypertension is not only short-term but can be long-lasting. Berlin's Charité observed 300 blood donors in a study. Half of them had high blood pressure; the rest had normal blood pressure. They were observed over the course of up to four regular blood donations that corresponds to nine to twelve months.
The observed blood pressure reduction in donors who started with moderate hypertension (grade II) was almost dramatic. Values fell by 17.1 mmHg systolic and 11.7 mmHg diastolic. Interestingly, the values in the normotensive control group remained unchanged. So no one with normal blood pressure needs to fear that donating blood will make their blood pressure too low.
Exactly why this happens is not yet fully understood. There are several theories. For example, the reduced iron level after donation could lower oxidative stress on the vessels, keeping them more elastic, which would help blood pressure regulation. Another theory is that the levels of blood-pressure-raising hormones and metabolites (metabolic byproducts) drop after donation, lowering blood pressure. Because the "lost" blood cells must also be newly formed, the reduced blood pressure could also be related to this: the newly formed blood components may be more elastic and easier to deform, so the circulation may require less pressure to move them.
Even those who don't donate regularly benefit as patients with high blood pressure. The blood-pressure-lowering effect after a single donation lasts about six weeks.
Regular blood donation becomes particularly interesting for people with hypertension against the background that even a small reduction of 2 to 3 mmHg can help protect against potentially fatal cardiovascular diseases. The blood pressure reduction achieved through regular donations is often much larger and can in some cases even surpass the effects of drug therapy.
Regular blood donation also improved donors' quality of life. Donors felt overall more capable and energetic, which may be due to an improved ability to neutralize free radicals or simply from the knowledge that they're doing something good.
There is, however, an age limit for blood donors. At present, new donors may be eligible up to their 65th birthday. Experienced donors may give blood until their 73rd birthday. This limit exists solely to protect donors. The blood itself does not lose quality as the donor gets older.
If you have questions about blood donation, you'll find lots of information and answers on the BRK blood donation service website 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 comes from BloodPressureDB – the leading app since 2011 that helps hundreds of thousands of people monitor their blood pressure every day.
Our content is based on carefully researched, evidence-based information and is continuously updated (as of 12/2025).
Author Sabine Croci is a certified medical assistant with many years of experience in internal medicine and cardiology practices as well as in outpatient care. Since 2015 she has led the editorial team at BloodPressureDB. With additional qualifications as a paramedic, first responder, and training in various therapy and emergency areas, she provides well-founded, practical, and reliably reviewed information.
Author Sabine Croci is a certified medical assistant with many years of experience in internal medicine and cardiology practices as well as in outpatient care. Since 2015 she has led the editorial team at BloodPressureDB. With additional qualifications as a paramedic, first responder, and training in various therapy and emergency areas, she provides well-founded, practical, and reliably reviewed information.
