What do you think are the health effects of never going out?

I'm a hermit. For the past 5 years, I've gone out maybe no more than 10 times (this number is no exageration). I don't go out due to my poor health but lately I've been actually considering... maybe the cause of my poor health in the first place is because I don't go out? Can someone actually get sick from not leaving the house?
What do you think are the health effects of never going out?
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