, Thank you both. I have been thinking that as Srap said, sometimes the words 'reason' and 'why' are ambiguous. So you have to look at the context and the intention of the speaker.

Also the example of evidences in arguments it's very clear. But, I came across with another text which has the same structure than the one before:

225 million women do not use safe and effective contraceptive methods. This is explained by many reasons, including lack of access to information or sexual health services.The problem is not only of women: there is a marked lack of support from their partners or the societies in which they live.

It doesn't seem to give an evidence of the assertion The problem is not only of women?

Thank you for taking the time to answer me. I understand what you said, but what about the reasons after the colon(:)? Are just reasons used to explain why it's unusual?