**Question:** Most common of all psychiatric disorders are

A. Schizophrenia
B. Major Depressive Disorder
C. Anxiety Disorders
D. Bipolar Disorder

**Core Concept:** The common psychiatric disorders refer to mental health conditions that are frequently diagnosed and affect a large portion of the population. These disorders can significantly impact an individual's daily life, relationships, and overall well-being.

**Why the Correct Answer is Right:**

B. Major Depressive Disorder (MDD) is the most common psychiatric disorder, affecting approximately 2-3% of the global population annually. MDD is characterized by persistent feelings of sadness, hopelessness, and loss of interest in activities, impacting mood, thoughts, and behaviors. It is often accompanied by physical symptoms such as fatigue, changes in appetite and sleep, and cognitive disturbances. MDD requires a minimum of 2 weeks of these symptoms without improvement in response to situational factors.

**Why Each Wrong Option is Incorrect:**

A. Schizophrenia (5-10% of the population) is a severe mental disorder characterized by delusions, hallucinations, disorganized speech, and behavior. While common, it is less common than Major Depressive Disorder.

C. Anxiety Disorders (10-20% of the population) encompass various conditions like Generalized Anxiety Disorder, Specific Phobia, and Social Anxiety Disorder. While common, they are less common than Major Depressive Disorder and Schizophrenia.

D. Bipolar Disorder (2-4% of the population) is characterized by extreme mood swings between manic and depressive episodes. It is less common than Major Depressive Disorder and Schizophrenia.

**Clinical Pearl:** Understanding the nuances between these disorders is crucial for accurate diagnosis and appropriate treatment planning by healthcare professionals.

**Correct Answer:** B. Major Depressive Disorder (MDD) is the most common psychiatric disorder, affecting approximately 2-3% of the global population annually. It is characterized by persistent feelings of sadness, hopelessness, and loss of interest in activities, impacting mood, thoughts, and behaviors. Major Depressive Disorder requires a minimum of 2 weeks of these symptoms without improvement in response to situational factors.