Fluid Shift

In microgravity, gravity no longer pulls bodily fluids downward, leading to a headward fluid shift. This causes facial puffiness, nasal congestion, and increased intracranial pressure. Over time, these effects can impact vision, cardiovascular function, and kidney activity. Fluid shift also influences hydration status and nutrient transport, making it a key consideration in space nutrition and physiology. Understanding fluid redistribution is essential for developing effective countermeasures to maintain astronaut health on long-duration missions.