An internalizing disorder (or internalising disorder) is one type of emotional and behavioral disorder, along with externalizing disorders, and low incidence disorders. People who have an internalizing disorder will keep their problems to themselves, or internalize the problems.
Signs and symptoms
Behaviors that are apparent in those with internalizing disorders include depression, withdrawal, anxiety, and loneliness. There are also behavioral characteristics involved with internalizing disorders. Some behavioral abnormalities include poor self-esteem, suicidal behaviors, decreased academic progress, and social withdrawal. Internalizing one's problems, like sadness, can cause the problems to grow into larger burdens such as social withdrawal, suicidal behaviors or thoughts, and other unexplained physical symptoms.
The internalizing disorders, with high levels of negative affectivity, include depressive disorders, anxiety disorders, obsessive-compulsive and related disorders, trauma and stressor-related disorders, and dissociative disorders,  bulimia, and anorexia come under this category,  as do dysthymia, and somatic disorders (in Huberty 2017) and posttraumatic stress disorder (in Huberty 2004).
- Smith, D.D. "Emotional or Behavioral Disorders Defined". education.com. Archived from the original on 31 March 2018. Retrieved 17 March 2014.
- "Internalizing Symptoms and Affect of Children with Emotional and Behavioral Disorders". studymode.com. Retrieved 17 March 2014.
- DiMaria, Lauren. "Internalizing Behaviors and Depression". about.com. Retrieved 17 March 2014.
- Regier, Darrel A.; Kuhl, Emily A.; Kupfer, David J. (June 2013). "The DSM-5: Classification and criteria changes". World Psychiatry. 12 (2): 92–98. doi:10.1002/wps.20050. PMC 3683251. PMID 23737408.
- Turygin, Nicole C.; Matson, Johnny L.; Adams, Hilary; Belva, Brian (August 2013). "The effect of DSM-5 criteria on externalizing, internalizing, behavioral and adaptive symptoms in children diagnosed with autism". Developmental Neurorehabilitation. 16 (4): 277–282. doi:10.3109/17518423.2013.769281. PMID 23617257.
- "Depression". helpguide.org. Archived from the original on 14 March 2014. Retrieved 17 March 2014.
Internalizing Disorder. Encyclopedia of Adolescence: sciencedirect.com. 2011. - Huberty 2004, 2017