Major Depressive Disorder (MDD): Causes, Symptoms, and Treatments
Step One: Locate a minimum of five scholarly (peer-reviewed) journal articles that will
help you learn about the disorder you selected (your textbook counts as a scholarly source
as well). When doing your research, you should look for articles that:
- describe/explain the symptoms associated with the disorder
- explain biological causes of the disorder
- explain psychological causes of the disorder
- explain socioeconomic causes of the disorder
- give you information about treatments for the disorder
, Introduction
Major Depressive Disorder (MDD) is one of the most prevalent and debilitating mood
disorders, characterized by persistent feelings of sadness, hopelessness, and loss of
interest in previously pleasurable activities. According to the Diagnostic and Statistical
Manual of Mental Disorders, Fifth Edition (DSM-5), MDD is diagnosed when a person
experiences at least five symptoms of depression over a two-week period, with at least
one being either depressed mood or loss of interest (American Psychiatric Association,
2022). Depression affects approximately 280 million people globally and is one of the
leading causes of disability worldwide (World Health Organization, 2023). This paper
reviews the symptoms, biological, psychological, and socioeconomic causes of MDD, as
well as evidence-based treatments aimed at improving outcomes for affected individuals.
Symptoms of Major Depressive Disorder
Symptoms of MDD encompass emotional, cognitive, physical, and behavioral domains.
Core symptoms include pervasive sadness, feelings of guilt or worthlessness, loss of
interest or pleasure, changes in appetite and sleep, psychomotor agitation or retardation,
fatigue, difficulty concentrating, and suicidal ideation. These symptoms cause significant
distress and functional impairment across work, social, and personal domains. Somatic
symptoms such as chronic pain, gastrointestinal disturbances, or cardiovascular changes
are common, reflecting the disorder’s systemic impact (Malhi et al., 2020). MDD can
present in episodic or chronic forms, and recurrent episodes often increase in severity and
resistance to treatment. Atypical depression, melancholic features, and seasonal patterns
are recognized subtypes that further diversify symptom presentation.
Step One: Locate a minimum of five scholarly (peer-reviewed) journal articles that will
help you learn about the disorder you selected (your textbook counts as a scholarly source
as well). When doing your research, you should look for articles that:
- describe/explain the symptoms associated with the disorder
- explain biological causes of the disorder
- explain psychological causes of the disorder
- explain socioeconomic causes of the disorder
- give you information about treatments for the disorder
, Introduction
Major Depressive Disorder (MDD) is one of the most prevalent and debilitating mood
disorders, characterized by persistent feelings of sadness, hopelessness, and loss of
interest in previously pleasurable activities. According to the Diagnostic and Statistical
Manual of Mental Disorders, Fifth Edition (DSM-5), MDD is diagnosed when a person
experiences at least five symptoms of depression over a two-week period, with at least
one being either depressed mood or loss of interest (American Psychiatric Association,
2022). Depression affects approximately 280 million people globally and is one of the
leading causes of disability worldwide (World Health Organization, 2023). This paper
reviews the symptoms, biological, psychological, and socioeconomic causes of MDD, as
well as evidence-based treatments aimed at improving outcomes for affected individuals.
Symptoms of Major Depressive Disorder
Symptoms of MDD encompass emotional, cognitive, physical, and behavioral domains.
Core symptoms include pervasive sadness, feelings of guilt or worthlessness, loss of
interest or pleasure, changes in appetite and sleep, psychomotor agitation or retardation,
fatigue, difficulty concentrating, and suicidal ideation. These symptoms cause significant
distress and functional impairment across work, social, and personal domains. Somatic
symptoms such as chronic pain, gastrointestinal disturbances, or cardiovascular changes
are common, reflecting the disorder’s systemic impact (Malhi et al., 2020). MDD can
present in episodic or chronic forms, and recurrent episodes often increase in severity and
resistance to treatment. Atypical depression, melancholic features, and seasonal patterns
are recognized subtypes that further diversify symptom presentation.
