Can geomagnetic storms affect your blood pressure?

Space weather might sound like something only astronauts need to worry about—but it actually affects everyone on Earth in surprising ways. Geomagnetic storms, the big cosmic events that disturb our planet’s magnetic field, may even influence human health, particularly blood pressure.

What are geomagnetic storms?

Geomagnetic storms happen when the Sun releases bursts of energy and charged particles during solar flares or coronal mass ejections (CMEs). When these particles hit Earth, they shake up the planet’s magnetic field. The result? Stunning northern lights—and subtle changes in the electromagnetic environment all around us.

Why would space weather affect your body?

It might sound like science fiction, but your body is electrically active. The heart, nervous system, and even individual cells use tiny electrical signals to communicate, move, and regulate bodily functions.

When a geomagnetic storm disrupts Earth’s invisible magnetic field, it could theoretically nudge the body’s own electrical systems.

Researchers explain: "Solar activity and the consequent geomagnetic activity (GMA) profoundly influence human biological rhythms and cardiovascular system functions. Although the response of blood pressure (BP) to GMA has attracted considerable attention, it is unclear whether the GMA can have an influence alone and how it occurs" (Communications Medicine).

The measurable effect on blood pressure

Studies show a real pattern: blood pressure can rise slightly during geomagnetic storms. While it’s not a dramatic spike, average readings often increase by 3–8 mmHg for both systolic and diastolic pressure.

For most healthy people, this is minor. But for those with preexisting hypertension, even a small increase can matter over time.

Who is most sensitive?

Not everyone feels the effects of solar storms equally. Researchers have found that the following groups may be more sensitive:

• People with high blood pressure
• Older adults
• Women, potentially due to physiological differences in environmental responses

How could geomagnetic storms cause this?

Scientists are still investigating, but some plausible explanations include:

Disruption of the body’s internal clock – Changes in the magnetic environment may affect circadian rhythms, which regulate blood pressure.

Stress hormone fluctuations – Hormones like cortisol could spike, causing blood vessels to constrict slightly.

Altered nerve and heart activity – Tiny shifts in nerve impulses or heart rhythm may contribute to small blood pressure increases.

Interestingly, these effects seem to align with periods of high solar activity, even when local weather, air pollution, and other environmental factors remain stable.

While the average geomagnetic storm won’t make your blood pressure skyrocket, people with hypertension, older adults, and women may want to stay mindful during periods of high solar activity. Tracking your blood pressure, practicing stress-reduction techniques, and staying in tune with your body could be especially important during solar maximum or intense geomagnetic events.