PAIN
| Acronym | Definition |
|---|---|
| PAIN | Protecting Animals in Need (Canada) |
| PAIN | Privacy, Authentication, Integrity, Non-Repudiation |
| PAIN | People Against Intrusive Noise (UK) |
| PAIN | Proteases and Inflammation Network (Canada) |
| PAIN | Phytotherapy-Associated Interstitial Nephritis (internal medicine) |