What are "reasons" and "excuse"? Are they the same thing?

Let say I am late going to school because I had stomachache, would it be excuse or reasons?

Why excuse always has negative perception while it is the reason why it happen?

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Dv8rs · 18-21, F

"The main function of a reason is not to justify, but to explain. Reason implies that fault is sincerely recognized and accepted…. that you step up and take accountability for your actions. An excuse exists to justify, blame or defend a fault…with the intent to absolve oneself of accountability."

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