They do, if they’re exposed in space. If you mean from just being in microgravity, there’s a host of side effects, including:
– bone density decreases steadily (risk of kidney stones, fractures, etc.)
– muscles deteriorate no matter how much you exercise
– Neuromuscular coordination deteriorates (balance, vision, orientation)
– blood pressures goes wonky when you return
– anemia and immunodeficiency
– increased intracranial pressure affects eyesight
– and the radiation of course
At the end of the day though, day to day functions of the human body don’t need gravity to function, so while space isn’t good for you, the basics you need to survive will keep humming along. Albeit worse for wear in some cases.
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