What is the primary difference between unipolar and bipolar depression regarding mood patterns?

Unipolar depression involves a continuous period of low mood (dysphoria), whereas bipolar depression involves fluctuations between low mood and periods of high energy or euphoria (mania).

How does clinical depression differ from normal sadness in terms of its cause?

Normal sadness is usually a temporary reaction to a specific life event (like loss), while clinical depression can occur without a clear external trigger and persists regardless of circumstances.

What is the difference between the 'key symptoms' and 'associated symptoms' in a mild depression diagnosis?

A mild diagnosis requires at least two of the three 'key' symptoms (low mood, loss of interest, low energy) plus two other associated symptoms (like sleep or appetite changes).

What is a common mistake when diagnosing depression based on a person's mood for only one week?

Diagnosing clinical depression requires symptoms to be present for more than two weeks; a shorter duration might indicate a temporary emotional reaction rather than a clinical disorder.

Why is it incorrect to assume that all depression is inherited?

While bipolar depression is highly heritable, unipolar depression can be caused by a combination of genetic factors and external environmental stressors.

What error occurs if a clinician diagnoses 'mild depression' with only one key symptom?

According to ICD standards, a mild diagnosis must include at least two of the three key symptoms (low mood, loss of interest, or reduced energy).

What does the term 'Anhedonia' refer to in the context of depression?

Anhedonia is the loss of interest or pleasure in activities that the individual previously found enjoyable, which is one of the three key symptoms of depression.

What is the ICD and who uses it?

The International Classification of Diseases (ICD) is a global diagnostic tool used by qualified medical professionals (doctors, psychiatrists) to classify physical and mental disorders.

Define 'Dysphoria' as it relates to unipolar depression.

Dysphoria is a state of overwhelming sadness, hopelessness, or despair that characterizes the low mood phase of depression.

Why is 'reduced energy' considered a key symptom rather than just a physical side effect?

Reduced energy is a core diagnostic feature because it directly prevents the individual from functioning in daily life, such as working or socializing, which defines the 'disorder' aspect of depression.

Diagnosing Unipolar Depression | AQA GCSE Psychology

Psychological Problems

Diagnosing Unipolar Depression

Summary

The diagnosis of unipolar depression is a clinical process guided by standardized classification systems like the International Classification of Diseases (ICD). It relies on identifying specific core symptoms, assessing their duration, and determining the overall severity based on the total number of symptoms present.

1. Definition & Core Concepts

Unipolar Depression is a clinical mood disorder characterized by a persistent and continuous state of low mood, distinguishing it from the fluctuating 'highs' and 'lows' of bipolar disorder.
The International Classification of Diseases (ICD), currently in its 11th edition (ICD-11), serves as the primary global diagnostic tool used by medical professionals to identify both physical and mental health conditions.
A critical distinction exists between clinical depression and normal human sadness; while sadness is a temporary response to life events, clinical depression is a persistent disorder that impairs daily functioning and occurs even in the absence of a specific external trigger.

2. The Three Key Symptoms

Low Mood (Dysphoria): This involves an overwhelming sense of sadness, hopelessness, or despair that persists regardless of circumstances.
Loss of Interest (Anhedonia): A significant decline in the ability to experience pleasure or interest in activities, hobbies, or social interactions that were previously enjoyable.
Reduced Energy Levels: A state of chronic fatigue or lethargy where the individual finds it difficult or impossible to perform basic daily tasks, such as attending work or maintaining personal hygiene.

Diagram showing the three key symptoms of unipolar depression (Low Mood, Loss of Interest, Low Energy) and the required duration of more than two weeks for diagnosis.

3. Classification of Severity

Mild Depression: Diagnosis requires at least two of the three key symptoms plus an additional two associated symptoms (such as sleep or appetite changes).
Moderate Depression: This is diagnosed when an individual presents with four or more symptoms in total, reflecting a higher level of impairment in daily life.
Severe Depression: A diagnosis reserved for cases where seven or more symptoms are present, often including significant physical and cognitive symptoms that make normal functioning nearly impossible.

4. Diagnostic Criteria & Methodology

5. Key Distinctions

6. Exam Strategy & Tips