Our expert says:
It's possible, one could never rule it out, and the fact that you've seemed to hit a plateau even while taking steroids is very unusual. It's impossible for me to guess at what the cause is - you've been training long enough to know what kind of workouts you need to increase muscle mass, so it's not a typical case of a guy who isn't training optimally. It's probably also not a case of inadequate diet, and so perhaps you've just hit a 'genetic ceiling', which can happen. I don't know what your current muscle mass or body mass are, so I can't guess at this.
If you have had blood tests, then presumably you have seen a doctor? If not, I would suggest that, and see if they can diagnose something - could be something like hyperthyroidism (though you'd probably have other symptoms, but can't rule it out). So yes, I'd see a doctor and treat it this way.
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