Not certain how to vote as I would classify it as all of the above. Injury? Yes. A psychic injury to the brain. Syndrome? Yes, as a syndrome is a group of symptoms that together make a specific condition. PTSD has many varied symptoms. Disorder? Yes again! Definition of disorder is a physical or mental dysfunction, and it does cause that. Illness yes also an illness, as it makes one ill in various ways. I would NOT say it was a disease, as that is something one may catch, but illness yes. However. Don't have PTSD, am a Carer so maybe my opinion doesn't count here. ;-) Jim.