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Astronauts readjust through several overlapping changes: their balance system must work with gravity again, their circulation must keep blood pressure steady when they stand, and their muscles and bones must bear weight. Some astronauts describe feeling wobbly for days; others report feeling nearly normal after about a week or mostly recovered within a couple of weeks. Those are individual accounts, not a standard recovery schedule.
Why returning to Earth feels different
In orbit, astronauts live in microgravity: gravity is still present, but the spacecraft and everything inside it are in free fall together. Without the familiar pull of body weight, the brain, circulatory system, muscles, and bones adapt to different conditions. Landing reverses the demands quickly, while those systems take time to readjust.
Circulation and standing
In weightlessness, fluid shifts toward the head. NASA reports that approximately 2 liters move from the lower to the upper body upon entering weightlessness. The body responds by reducing total blood volume. After landing, gravity draws fluid toward the lower body, and some astronauts have difficulty maintaining arterial pressure and blood flow to the brain while upright. NASA calls this orthostatic intolerance; it can cause lightheadedness, presyncope, or fainting. It is more specific than simply feeling dizzy: the problem is maintaining circulation when standing.
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NASA’s Cardiovascular and Vision Laboratory says more than 60% of astronauts can be affected by orthostatic intolerance if no countermeasures are used. NASA describes countermeasures such as gradient compression garments and fluid-loading protocols, but these are managed crew procedures, not self-care recommendations. NASA: Cardiovascular and Vision
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Balance, orientation, and movement
The nervous system adapts to the sensory conditions of weightlessness. NASA says astronauts rely primarily on vision to orient themselves in space; after landing, the brain has to integrate inner-ear balance signals with visual information under gravity again. During this adjustment, people may experience spatial disorientation, impaired posture or walking, motion sickness, and reduced fine-motor control. NASA refers to motion sickness associated with the return to Earth’s gravity as terrestrial readaptation motion sickness.
That can make familiar actions unexpectedly demanding. NASA identifies balance, steadiness, hand-eye coordination, and visual perception as operational concerns after gravity transitions. Even walking from a landing vehicle toward a habitat can be harder immediately after touchdown. A NASA astronaut, Andreas Mogensen, described an early postlanding test: “With eyes closed, it was almost impossible to walk in a straight line.” NASA: Walk the Line
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Muscles, bones, and the feeling of weight
In microgravity, the body does not support its weight in the same way it does on Earth. Spaceflight can reduce aerobic capacity and muscle and bone strength; astronauts exercise during missions to counter these changes and help preserve health and performance. On return, the feet, back, and muscles must again handle body weight and everyday loads. NASA interviewees have described sore feet and lower backs, hard seats feeling uncomfortable, a sensation of heaviness, and the need to retrain smaller muscles.
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Vision is a related, distinct issue
Spaceflight-associated neuro-ocular syndrome (SANS) involves findings related to the eyes and vision during long-duration missions. NASA says approximately 70% of crewmembers participating in long-duration missions of about six months on the International Space Station develop SANS findings. This is not the proportion of astronauts with short-term balance problems after landing. NASA continues to study SANS, including its cause and long-term implications. NASA: Cardiovascular and Vision
How long readjustment takes
There is no single timetable in NASA’s published astronaut accounts. In a September 9, 2025, NASA article, Jasmin Moghbeli said, “I felt wobbly for the first two days,” while Loral O’Hara said she felt almost completely back to normal a week after returning. Frank Rubio, after a 371-day mission, described sore feet and a sore lower back and said he felt mostly recovered within a couple of weeks. Satoshi Furukawa described becoming more stable day by day. These experiences show that some symptoms ease within days while other aspects of recovery take longer; they do not establish a clinical norm or a formula based on mission duration, age, fitness, or sex. NASA: Life After Microgravity
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How NASA studies and supports the transition
Functional tests after landing
NASA has used a seven-test Functional Task Test to study balance control after landing. The test focuses on tasks relevant to mission demands following gravity transitions, helping researchers examine physical performance rather than relying only on how someone feels. NASA’s work also considers practical activities such as capsule egress and tasks performed in a simulated spacesuit. NASA: Walk the Line
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Monitoring across a mission
NASA’s CIPHER research program includes 14 studies with measurements before, during, and after spaceflight. Its assessments include eye and vision exams, cognitive and spatial-reasoning tests, cardiovascular imaging, exercise and sensorimotor testing, and MRIs. A component evaluates postflight fitness through capsule egress and simulated suited surface tasks. The program is designed to improve understanding of crew health and performance and inform safeguards for future missions; it is research, not a proven rehabilitation plan for the public. NASA: CIPHER
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