1. Invalid or expired visa: If your visa is not valid or has expired, you may be denied entry.
2. Insufficient documentation: Failure to provide required documents, such as a valid passport, return ticket, or proof of financial resources.
3. Criminal record: Possessing a criminal record or being deemed a security risk may result in denial of entry.
4. Health concerns: If you have a contagious disease or are deemed a health risk, you may be refused entry.
5. Overstaying a previous visa: If you have previously overstayed a visa in the Philippines, you may be barred from re-entry.
6. Providing false information: Giving false information or misrepresenting yourself on your visa application or during the immigration process.
7. Blacklisted or flagged: If you’re on a blacklist or flagged by immigration authorities for any reason.
8. Incomplete or inaccurate immigration forms: Failure to properly fill out immigration forms or provide accurate information.
9. Lack of proof of onward travel: Not having a return ticket or proof of onward travel may raise suspicions.
10. Immigration violations: Violating immigration rules or regulations, such as working without a permit.

This is a example of why you may not be allowed entry. This is not a comprehinsive list of disqualifications. Contact the Bureau of Immigration if you have any concerns.