What are the signs or symptoms of ptsd?

Quite a few of them.: There are many signs and symptoms--see the image included here. I assume you or someone you know maybe experiencing some emotional difficulty? If so, please consult doc/therapist/psychiatrist for an evaluation and treatment. It is not easy, but doable with appropriate/adequate support. Best of luck to you.

Intrusive memory,anx: Symptoms of ptsd grouped in thre types 1intrusive memory, like flash backs, or reliving traumatic events, upsetting dreams about the same 2incresed anxiety and hyperarousal, like numbing and irritability, guilt, self destructive behaviour like drugs and drinking, insomnia, frightened, hallucination 3avoidance and numbing, not enjoying activities you enjoyed before, loss memry, diffulty in close relationships.

Symptom inquiry: The doctor should inquire if the patient has been in a situation where the patient believes loss of life or catastrophic injury was imminent, and with no means of escape. Symptoms from these experiences include, hypervigilance, sleep loss, nightmares, reliving the trauma, social withdrawal, anhedonia, temper outbursts, emotional withdrawal, feelings of unfinished business, and adrenalin seeking.

Symptom Clusters: The diagnosis of PTSD requires four sets of symptom clusters, including intrusion or re-experiencing, avoidance of people, places, and things associated with the trauma, negative alterations in mood or thought, and hyper-arousal. Less commonly, dissociation may occur where feelings of being disconnected from oneself or the sense that that one's surroundings aren't real are experienced.