Is it really unhealthy for me to suppress my anger and frustration all the time?

Just wondering. I used to have a bad temper during my early teen years. Now I control it better. However, it's still not pretty when either someone actually tries to piss me off or when I'm very frustrated with something. I suppress those feelings because I don't want to give people problems or give myself any more problems then I've already had with my life. When I suppress my anger somewhere very isolated and private, I might end up throwing one punch at wall to help let some of my anger go without causing trouble. I'm not a violent person if that's what you're thinking (I only resort to violence if someone tries to hurt me or hurt the people I care for or if they constantly threaten and harass me nonstop without letting me go).

Every time I suppress my deep angry, I end up feeling soreness and irritation in some parts of my internal organs (my intestines, etc.) and a bit of a headache.
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Is it really unhealthy for me to suppress my anger and frustration all the time?
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