New Cancer Therapy and Antibiotics? What Medicine Can Learn from Space Travel - How Microgravity Warps Astronauts' Bodies in Space

Life in space poses serious challenges for the human body. Astronauts on the International Space Station often develop swollen heads and thin legs due to microgravity. This unusual effect is just one of many health risks they face far from Earth. In microgravity, fluids move differently than on Earth. The heart pumps blood more towards the upper body, causing puffy heads and spindly legs in astronauts. This shift also raises blood pressure in the head, which can harm their eyes over time.

Microgravity does not only affect circulation. Many other biological processes change in space, adding to the strain on the body. On top of this, cosmic radiation exposes astronauts to higher cancer risks, making space an inherently hostile environment for humans. The lack of gravity disrupts normal bodily functions and creates lasting health problems. Radiation adds another layer of danger. Together, these factors show how difficult long-term survival in space remains for humans.