This Practice Note, produced in partnership with Osmosis from Elsevier, provides a concise medical overview of trauma and abuse-related disorders for personal injury lawyers handling psychiatric injury and psychological harm claims. For further guidance, see: Osmosis from Elsevier video: Post-traumatic stress disorder (PTSD)—causes, symptoms, diagnosis, treatment & pathology and Osmosis from Elsevier video: Somatic symptom disorder—causes, symptoms, diagnosis, treatment & pathology. Generally, what are they? Pathology and causes • mental disorders caused by or associated with past traumatic or stressful event • abuse—intentional mistreatment of others; may be directed at anyone and often features children or the elderly ◦ increases risk of the target developing a mental disorder, generally results in depression or aggressiveness and may incite post-traumatic stress disorder • psychological symptoms lead to behavioural changes • individuals might self-medicate with substance use Signs and symptoms • anxiety or fear associated with traumatic or stressful stimuli • reduced pleasure, self-acceptance, depression, anger, aggressiveness,