理由 - to Aska_Z's point usually uses in negative context also equivalent to 理由;缘故;借口. 原因 - usually used in neutral context and there's no other negative association with it. This is an excellent question - as a native speaker I have think for a while to answer :)

两者的意思就不同了。理由：事情的道理，根由。/原因：造成某种结果或引起另一事情发生的条件。

I agree with Aska_Z,'理由'is more like an excuse. “理由“ is usually used some matters that u don't think it is pleasant.(or u r blaming someone and ask someone give u a explain).E.g. 你有什么理由认为我会回家？

理由和原因有什么区别？理由和原因使用起来有什么区别？ “理由”这个词通常用于你想说服某人的时候。

没有任何区别，　只有读得顺就行!