You absolutely can self diagnose. Your self diagnosis is not as reliable, thorough, or trustworthy as a professional diagnosis. Self diagnosis is often the fir

You absolutely can self diagnose. Your self diagnosis is not as reliable, thorough, or trustworthy as a professional diagnosis. Self diagnosis is often the first step towards a professional diagnosis. You can choose to believe self diagnosis is low or zero value, but that's your own value judgement, which is separate from "can" and "cannot".