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Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Going to Mars could stress the human cardiovascular system, but no study shows that a Mars journey would literally rupture a heart or inevitably cause heart failure. The evidence points to three separate hazards: microgravity changes how the heart and blood circulate, long missions can alter cardiac structure, and radiation outside Earth’s magnetic protection may raise long-term cardiovascular risk. A complete Mars expedition would combine all three for far longer than any human mission has yet tested.
What scientists actually found
The dramatic headline compresses several findings into one phrase. In orbit, weightlessness changes the loads placed on the heart and blood vessels. A 2025 MRI study found a measurable reduction in part of the heart muscle after long missions. NASA also identifies deep-space radiation as a potential cause of later heart, blood-vessel and cerebrovascular disease. None of those findings demonstrates that astronauts will suffer immediate heart failure on Mars.
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Microgravity changes circulation and cardiac loading
NASA explains that fluids shift from the legs toward the chest and head when gravity no longer pulls them downward. Blood volume then falls as the body adapts. The heart changes shape from an oval, water-filled-balloon form to a rounder shape, and muscles in vessel walls that normally constrict blood vessels can atrophy. Those changes make circulation less effective when gravity returns.
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After landing, some astronauts have difficulty maintaining blood pressure while standing. The result can be orthostatic intolerance: dizziness, light-headedness or fainting. That is a problem with circulation and pressure regulation, not evidence that the heart has physically “broken.”
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The 2025 MRI study measured structural change
Researchers used MRI scans of nine male cosmonauts whose missions lasted an average of 247 ± 90 days. Shortly after return, left-ventricular papillary-muscle mass was 14% lower than before flight. Papillary muscles help the heart valves close properly during contraction.
| Evidence | Exposure or cohort | Measured result | How to interpret it |
|---|---|---|---|
| Nature Portfolio/npj Microgravity study, 2025 | 9 male cosmonauts; missions averaged 247 ± 90 days | 14% reduction in left-ventricular papillary-muscle mass | A structural adaptation was detected; the study did not establish heart failure |
| Same MRI study | Measurements taken shortly after return | Ventricular volumes, ejection fraction and strain did not change | Pumping performance and measured deformation remained stable in this small cohort |
| NASA Axiom-1 heart-health summary | 17-day mission | 14 cardiac, liver and kidney biomarkers remained within normal ranges | Reassuring for a short flight, but not a test of a multiyear Mars expedition |
| NASA Mars radiation planning | Longest proposed Mars missions | Exposure may approach or exceed a 600 mSv standard | A projected long-term risk concern, not a demonstrated clinical outcome in Mars travelers |
Why a 14% muscle reduction is not the same as heart failure
The papillary-muscle result is important because it gives researchers a specific anatomical measurement, but it must not be translated into a 14% loss of pumping ability. The study reported unchanged ejection fraction and strain, which are measures of how well the ventricle contracts. It involved only nine men and followed them around the time of landing, so it cannot establish how common the change is, whether it persists, or what it would mean after a complete Mars mission.
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Why a Mars mission is a tougher cardiovascular test than the ISS
Months of weightlessness, followed by partial gravity
NASA’s Mars hazard description uses roughly six months of weightlessness during the trip to Mars and as much as two years living and working in three-eighths of Earth’s gravity on the surface. That is a different exposure pattern from a short orbital flight: the body would spend months adapting to microgravity, then operate for a long period in a gravity field that is weaker than Earth’s but stronger than orbit.
Each transition challenges blood-pressure control and muscle conditioning. The available human measurements do not yet show how the 14% papillary-muscle change, fluid shifts and reduced vascular conditioning would interact across transit, surface operations and the eventual return journey.
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Deep-space radiation adds a separate hazard
Earth’s magnetic field and atmosphere provide substantial protection from space radiation. Farther from Earth, crews face more exposure to galactic cosmic rays and solar-particle events. NASA describes radiation as an invisible hazard and says the longest Mars missions could approach or exceed a 600 mSv standard. NASA planning and research associate that level of exposure with increased risk of cardiovascular, vascular and cerebrovascular disease.
This is a risk projection, not a report that a Mars traveler has already developed radiation-induced heart disease. Shielding, mission timing and solar-weather protection affect the actual dose, and the combined effects of radiation and altered gravity remain an active research question.
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What short missions tell us—and what they cannot
During the 17-day Axiom-1 mission, 14 cardiac, liver and kidney biomarkers stayed within normal ranges in the astronauts studied. That finding suggests the monitored short-term exposure did not produce an obvious biochemical injury signal. It cannot validate a mission lasting months in transit and up to two years on Mars, because duration, gravity transitions and radiation environment would all be different.
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How researchers plan to protect astronauts’ hearts
Countermeasures are being developed rather than treated as solved technology. Current research areas include:
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- Exercise: regular resistive and aerobic training to limit cardiovascular and muscular deconditioning during weightlessness.
- Fluid management: strategies to support blood volume and reduce the severity of blood-pressure problems after landing.
- Cardiovascular monitoring: repeated imaging, vital-sign checks and biomarker measurements to detect changes before they become dangerous.
- Radiation shielding: spacecraft and habitat designs intended to reduce accumulated dose, especially during solar-particle events.
- Engineered tissues and organ chips: laboratory models that let researchers study radiation and altered gravity without waiting for a full Mars mission.
None of these measures has yet been demonstrated across the entire Mars mission profile. Their effectiveness will depend on how well they work together over years rather than days or months.
What remains unknown
- Whether the papillary-muscle reduction reverses, stabilizes or progresses long after return.
- How the finding applies to women, older astronauts or people with different baseline cardiovascular risks.
- Whether long-duration radiation exposure produces clinically meaningful heart disease in Mars crews.
- How six months of weightlessness and prolonged three-eighths gravity affect one another when combined with radiation.
- Which exercise, fluid and shielding protocols will keep blood pressure and cardiac function reliable during surface operations and re-entry.
The most accurate answer to “Can going to Mars damage your heart?” is therefore yes, it could create meaningful cardiovascular stress and may increase long-term disease risk—but current evidence does not show inevitable heart failure or a literally broken heart. The 2025 MRI result is an early warning that long missions change cardiac anatomy; it is not a forecast of mission failure.
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