Problem:
Delusional Disorder (DD) is a psychotic disorder marked by the presence of persistent, non-bizarre delusions lasting at least one month, without other prominent psychotic symptoms such as hallucinations or disorganized thinking. Unlike schizophrenia, individuals with DD often maintain relatively normal functioning outside the delusional beliefs.
Genetic vulnerability is a well-established risk factor for DD, with multiple genetic influences contributing small effects that collectively increase susceptibility, especially in those with a family history of psychotic disorders (Cardno & McGuffin, 2006). Additionally, cognitive decline, notably in postmenopausal women, has been identified as a significant risk factor, likely due to neurobiological changes that increase the risk of hallucinatory or delusional symptoms (González-Rodríguez, Esteve, & Álvarez, 2019).
On the other hand, protective factors such as strong social support and psychological resilience help mitigate distress associated with delusional ideation. Individuals with robust coping skills and a positive self-concept tend to experience less symptom severity and maintain better reality testing (Brasso et al., 2021).
The prevalence of DD is low, with a lifetime rate estimated around 0.2% and an annual incidence of approximately 15.6 cases per 100,000 individuals. The disorder appears more frequently in clinical and forensic populations (González-Rodríguez et al., 2019).
Cultural context plays a critical role in the content and interpretation of delusions. Beliefs considered delusional in one culture may be normative in another, necessitating careful cultural assessment to avoid misdiagnosis. Culture-bound syndromes and widely held supernatural beliefs can obscure clinical evaluation (Murphy, 2020).
Differential diagnosis is important, as DD must be distinguished from schizophrenia, mood disorders with psychotic features, and medical or neurological conditions causing secondary delusions. Somatic-type delusions should also be differentiated from disorders such as body dysmorphic disorder (González-Rodríguez et al., 2022).
Comorbidities commonly seen with DD include depression, anxiety disorders, and certain personality disorders, particularly Cluster C types. Substance use and cognitive impairment may also co-occur, complicating treatment (de Portugal, Martínez, & González, 2011).
Telehealth assessment of DD poses both challenges and opportunities. While increasing access, telehealth limits observation of subtle nonverbal cues and environmental context. Technical issues like audio or video delays can exacerbate paranoia or reinforce delusions, so clinicians must ensure secure, private, and stable setups while addressing potential mistrust of remote care (Donahue, Rodriguez, & Shore, 2021).
A unique feature of DD is the encapsulation of delusions, where cognitive and emotional functioning outside the delusional belief system remains largely intact. Treatment resistance is common due to poor insight and reluctance to seek care. The risk of harm to self or others is generally lower than in schizophrenia but increases if delusions involve persecution or jealousy (Cardno & McGuffin, 2006).
The DSM-5-TR allows specifiers for DD based on delusional themes such as persecutory, grandiose, somatic, jealous, erotomanic, mixed, or unspecified, with severity rated by distress and functional impairment.
Major Depressive Disorder (MDD) is a mood disorder involving a persistently, clinically significant depressed mood. MDD may be signaled by a loss of interest in activities that were once rewarding and/or enjoyable (APA, 2022). Perhaps the most common mental health diagnosis in the world today, five or more symptoms must recur in the same two-week period to make this diagnosis (APA, 2022).
Relevant symptoms include depressed/irritable mood; too much or too little sleep; lack of concentration, focus, or making decisions; feelings of worthlessness, shame, or guilt; and suicidal ideation (APA, 2022). Symptoms must be measurable in terms of psychological distress and/or clinically impaired functioning, socially, occupationally, or otherwise (APA, 2022). At least one mood-related symptom or lack of interest in previously pleasurable activities must be present (APA, 2022).
There are analytical measurement tools available to assess the severity of MDD symptoms, ranging from never to nearly every day, and the accumulation of the total helps define the severity of MDD itself (APA, 2022). Weight gain or loss, along with increased or decreased appetite, may occur in MDD (APA, 2022). Similarly, psychomotor agitation, such as fidgeting, or retardation, the opposite, moving too slowly, are potential symptoms (APA, 2022).
Risks, Protection, Prevention
MDD may have a genetic component. Therefore, a biological family history of depression diagnoses is important to determine. Ideally, the client may know information such as diagnosis, demographics, treatment(s), and prognosis, which might help inform their therapy (Alon et al., 2024). Persistent stress, regardless of domain or nature, may also linger into adulthood, even from early childhood development to the present, leading to MDD (Alon et al., 2024).
There are many coping skills that can be learned over time, including mindfulness, meditation, yoga, breath control, problem-solving tools, achievable goal-setting, and emotional regulation (Alon et al., 2024). Social networks and close personal relationships help to counter the accumulation of stress-related factors (Alon et al., 2024).
Cultural Considerations
As with many serious or chronic mental health concerns, stigma in many cultures or subcultures is significant enough to prevent diagnosis or treatment until very deep into an existential crisis (Mishu, 2023). In the UAE, for example, where I was a Professor of Command Psychology at Zayed Military University, mental health is so stigmatized that the recommendations of the medical community there are to take leave from work, limit what you tell people about your leave, except to go on vacation or visit family abroad, and get treatment in a different country. Even just managing mental health medications consistently in these highly stigmatized environments is a challenge.
Differential Diagnoses
Other depressive disorders may show similar symptoms, onset, and duration at the time of the assessment and diagnosis (APA, 2022). While some disorders may benefit from similar treatment modalities, the risk is particularly with missing a bipolar (or even schizophrenia) diagnosis, as the treatment modalities differ. Both in terms of applicable therapies and potential medications (APA, 2022).
Manic and hypomanic episodes are not symptoms of MDD and are more fitting for other conditions, such as bipolar (APA, 2022). It may be challenging to differentiate from a substance use disorder as well until the assessment can occur in a sober setting, if not at present (APA, 2022). When such notes are in the DSM-5-TR, they serve as helpful exclusionary criteria, rule-out symptom(s), and, when appropriate, as part of a diagnostic hierarchy (APA, 2022).
Comorbidities
As the cause of MDD at the onset can be complex, mental health comorbidities may include PTSD, insomnia/sleep irregularities, anxiety, and substance use disorder (Ren et al., 2025). Panic attacks, cardiovascular disease, and diabetes are also common (Ren et al., 2025). Reduced self-care and personal hygiene may also be observed (Ren et al., 2025).
Interestingly, in 2017, he was mistakenly diagnosed with an idiopathic coma at the local Veterans' Affairs Medical Center intensive care unit for over three months. By chance, my father, who suffered many ailments, including sleep apnea, diabetes, and cardiovascular disease (comorbidities), later in life, but had never had a mental health diagnosis or treatment history, was visited by a psychiatrist.
The psychiatrist hypothesized that my father was in a fugue state and not a coma at all, owing, in part, to the lack of any definitive underlying cause of the coma. He was prescribed Seroquel (quetiapine), an antipsychotic commonly used to treat schizophrenia and sometimes used for MDD (Maneeton, 2012). My father quickly recovered healthier from his stay with respect to his other ailments and previously excessive body weight.
Telehealth Considerations
If an in-person assessment is not possible for whatever reason, telehealth is an option, especially for healthcare or mental health "deserts." Telehealth significantly increases access, especially to minority, rural, and low socioeconomic status communities. However, telehealth significantly limits practitioners' ability to observe much of the client's body language, posture, or off-screen actions (Belanger et al., 2023).
Also, it may be difficult to assess the role of comprehension, clarity, and speech irregularities compared to the effects of various technologies (Belanger et al., 2023). The practitioner also loses control over the environment and relies on the client to make good choices regarding the appropriate time and place (Belanger et al., 2023).
Special Considerations
There is a clear linkage between MDD and the increased likelihood of suicide. Comorbidities and, especially, substance use disorder amplify this risk further (APA, 2022; Ren et al., 2025). Safety planning is very important, as are frequent reassessments of suicidal ideation. This situation is more complex in a telehealth format (Ren et al., 2025; Belanger et al., 2023).
Respond to at least two of your colleagues (one assigned to each of the other two disorders) and compare your assigned disorder to your colleague's assigned disorder. Discuss comorbidity between your assigned disorder and the other disorders. Need Assignment Help?
Cite at least one scholarly resource in each of your substantive reply posts.
References:
Slavich, G. M., & Auerbach, R. P. (2018). Stress and its sequelae: Depression, suicide, inflammation, and physical illness. In J. N. Butcher, & J. M. Hooley (Eds.), APA handbook of psychopathology: Psychopathology: Understanding, assessing, and treating adult mental disorders, Vol. 1 (pp. 375-402). American Psychological Association.
Pizzagalli, D. A., Whitton, A. E., & Webb, C. A. (2018). Mood disorders. In J. N. Butcher, & J. M. Hooley (Eds.), APA handbook of psychopathology: Psychopathology: Understanding, assessing, and treating adult mental disorders, Vol. 1 (pp. 403-427). American Psychological Association.
Rodebaugh, T. L., Weisman, J. S., & Tonge, N. A. (2018). Anxiety disorders. In J. N. Butcher, & J. M. Hooley (Eds.), APA handbook of psychopathology: Psychopathology: Understanding, assessing, and treating adult mental disorders, Vol. 1 (pp. 429-454). American Psychological Association.
American Psychiatric Association. (2022). Bipolar and related disorders. In Diagnostic and statistical manual of mental disorders (5th ed., text rev.). American Psychiatric Publishing.
Note: Focus on the "Diagnostic Criteria" and "Differential Diagnosis" sections of the DSM-5-TR for each diagnosis.
American Psychiatric Association. (2022). Depressive disorders. In Diagnostic and statistical manual of mental disorders (5th ed., text rev.). American Psychiatric Publishing.