Comorbid mental disorders in internal , neurological and oncological diseases

Comorbid means that they coexist at the same time. They can coexist by chance (e.g. a depressed patients getting a diagnosis of MS without any correlation) or a causative relationship (i.e. substance use disorder → liver cirrhosis or liver cirrhosis → hepatic encephalopathy (psychosis))

Examples of co-morbid disorders in...

 * F06: Other mental disorders due to brain damage and dysfunction and to physical disease

...Internal diseases

 * e.g. in the DDx of Dementia → always screen TSH (hypothyroidism) and B12 as their secondary causes
 * Pheochromocytoma: a tumor of the adrenal medulla → state of anxiety, sweating
 * Cushing disease: insomnia, anxiety, depression, mania, psychosis
 * IHD: depression, type A personalities
 * Peptic ulcer disease/IBD: psychological stress playing a role in the etiology? depression in any chronic disease
 * Infectious
 * HIV: anxiety, depression, social stigma. organic psychiatric syndromes: encephalitis, delirium, AIDS dementia
 * Neurosyphilis: general paralysis of the insane. personality changes and deficits of memory and judgement

...Neurological diseases

 * MS: cognitive impairment due to plaques, depression
 * Basal ganglia disorders
 * e.g. Huntington disease
 * Dementia (particularly executive dysfunction)
 * Major depressive disorder (possibly including suicidal tendencies)
 * Aggression and psychosis
 * Apathy
 * Anxiety
 * e.g. Parkinson disease: depression, dementia, personality changes
 * SLE: neuropsychiatric disorders → e.g. headache, depression, cognitive dysfunction

...Oncological diseases

 * kübler-ross mode (in patients or close contacts), MDD (risk group of it),

Links
https://icd.who.int/browse10/2019/en#/F95 (ICD-10 Classification)