1. Fluid Redistribution
One of the most noticeable effects of microgravity is fluid redistribution. Without gravity pulling fluids toward the legs, water, blood, and other bodily fluids shift upward to the head. This leads to the classic “puffy face” look, with swollen cheeks and nasal congestion, often reported by astronauts. Over time, this fluid shift can increase intracranial pressure and even affect vision, making it a significant concern for long-duration space missions. [Source: NASA]