A six month stay at the international space station can be a big pain in the back. While they may gain 2 inches of height while space temporarily, that accompanies weakening of the muscles supporting the spine. Astronauts have been reporting back pains since the late 1980's, up to 28% said that there was moderate to severe back pain sometimes it lasts for the whole duration of their mission. In the first year after their mission, they have a 4.3 times higher risk of getting a herniated disk.
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