Hi

Please note that every visa rejection has his own reasons, and it depends also of the Country and the Embassy you applied from,

But the most common reasons for failed visa applications are :

1. Past or Current Criminal Actions
2. False Travel Document
3. Insufficient Explanation For The Purpose And Circumstances Of The Planned Stay
4. Damaged Passport
5. Passport Invalidity
6. Lack To Proof The Travel Itinerary
7. Invalid Letter of Reference
8. Insufficient Means Of Subsistence
9. Unacceptable Birth Or Marriage Certificate
10. Invalid Travel Insurance
11. Lacking to present a Proof of Accommodation
12. Unfavorable Schengen Visa Situation

 Please provide us with more details such as the Country you applied from or applied to, and we’ll help you with the question on how to know the exact reason for the refusal