Conditions

What is Major Depressive Disorder? Symptoms, Causes, and Treatment

Major Depressive Disorder (MDD) is a prevalent mental health condition that affects millions, causing persistent sadness, fatigue, and a loss of interest in daily activities. Here we explore the symptoms, causes, and treatment options for MDD, offering insights to help you better understand the condition and find the right support for managing it effectively.

Taylor Stranaghan By Taylor Stranaghan
Child comforts upset mother.

Updated on Aug 27, 2024

Living with a constant, persistent feeling of sadness, exhaustion, and in a state of despair can weigh heavily on anyone. Like being trapped in a deep, dark hole without a ladder to climb out of, we are left feeling alone, hopeless, and overwhelmed.

This experience is commonly known as Major Depressive Disorder (MDD). The experience of MDD can certainly differ from person to person, yet common threads of intense sadness and disconnection often emerge.

If you’ve been feeling any of these symptoms, you are not alone.

MDD is a significant, yet somewhat under-discussed mental health condition. We are here to shed more light on the symptoms, causes, and treatment to raise awareness, foster understanding, and provide support for those affected.

What is Major Depressive Disorder?

Major depressive disorder, sometimes referred to as clinical depression, is a serious mental illness characterized by episodes of persistent sadness, loss of interest in activities, fatigue, feelings of guilt or worthlessness, and a myriad of other symptoms.

MDD is the most common type of depression affecting 21 million adults across the United States, with prevalence rates almost twice as high in women compared to men.

MDD is different from other mood disorders, and symptoms in each diagnosis can be different. Perhaps the most impactful aspect of MDD is that it disrupts the essential aspects of our day-to-day lives. This includes making it difficult to want to engage in activities that once brought us joy, maintain relationships that matter to us, and even perform basic chores around the house.

With MDD affecting children as young as 12 years old, early detection and treatment is a top priority.

Signs and Symptoms of Major Depressive Disorder

During a depressive episode, individuals experience a range of symptoms affecting their mind, body, emotions, and behavior.

According to the current Diagnostic and Statistical Manual of Mental Disorders (DSM-5), to qualify for a diagnosis of major depression, there must be at least five or more of the following symptoms present:

It is important to note that individuals suffering from major depression may experience episodes with varying degrees of severity.

Suicidal Thoughts or Behaviors: Warning Signs

Recognizing suicidal thoughts or behaviors in ourselves and others is crucial for safety, intervention, and seeking support.

The World Health Organization (WHO) identifies several strategies to consider if you are struggling with thoughts of suicide.

These include:

If you or someone you know is in danger of harming yourself/themself, contact emergency services or a crisis line for immediate support.

Causes of Major Depressive Disorder

While there is no one ‘root cause’ of major depression, there are several factors that come into play to contribute to its onset and development.

Biological Factors

MDD has a strong link to our biology.

Based on current research, here is what we know:

  1. Individuals with major depression often have high levels of cortisol in their blood, demonstrating over-activation of the hypothalamic-pituitary-adrenal (HPA) axis causing an increased stress response and altered mood and emotional state
  2. MDD exhibits dysregulated neurotransmitter levels (i.e. serotonin, dopamine, and norepinephrine) contributing to altered mood, emotions, and cognitive functioning
  3. Major depression shows a strong familial and genetic link, with relatives of affected individuals at a higher risk of developing the disorder

As a result of these biological factors linked to major depression, individuals experience a complex interplay of mood changes, emotional turbulence, and cognitive challenges.

Psychological Factors

On the psychological side, many factors can both contribute to and worsen symptoms of major depression.

Low self-esteem or issues related to our self-perception can cause us to withdraw from social settings, avoid new experiences, and shy away from challenges that could help us grow. Low self-esteem can impact our mental health and even lead to more serious issues including depression and anxiety disorders.

Similarly, certain cognitive patterns, such as negative self-talk, can perpetuate feelings of worthlessness and hopelessness and worsen depressive symptoms. This 2021 study found negative self-talk can change our brain states, affecting our confidence, cognitive performance, and levels of motivation.

Environmental Factors

Our environment plays a prominent role in our health. Individuals experiencing adverse life events or unexpected stressors, such as divorcing a spouse, losing a loved one, or facing a trauma event are more likely to develop depression later in life.

Other contributing environmental factors include:

These factors can vary in their impact from person to person, and often, multiple factors may contribute to the development or exacerbation of depressive symptoms.

Interplay of Multiple Factors

Most often, these factors interact and amplify their collective effect on our well-being.

According to a 2015 NIH study, MDD is a “multifactorial and polygenic disorder,” meaning that it is likely that multiple factors overlap to contribute to the development and exacerbation of depression.

For instance, having the genes for MDD along with living in certain stressful conditions can act cumulatively throughout our lifetime, creating the ‘perfect storm’ for depression.

Diagnosis of Major Depressive Disorder

The path to diagnosing major depression can look a little different for everyone. However, the common process involves a clinical assessment involving history taking and assessment tools.

Clinical Assessment

According to the DSM-5, a formal diagnosis of major depression requires individuals to experience episodes that vary in duration, typically lasting for at least two weeks.

These episodes require at least five symptoms described earlier, causing significant distress or impairment in social, occupational, or other important areas of functioning.

Receiving a comprehensive clinical assessment is central to the diagnosis process. This is often performed by a psychiatrist or other licensed mental health professional, which includes:

Physicians may also interview family members, caregivers, or friends to gain a complete understanding of a patient’s current levels of functioning and support networks.

Assessment Tools

The use of self-assessment and clinician-administered tools and rating scales helps determine both the type and severity of depression. Common tools include:

While some tools overlap in their design, each provides valuable insight into MDD symptomatology to allow for more efficient and effective diagnosis and treatment planning.

Role of Healthcare Providers

Healthcare providers play a distinct role in diagnosing major depression.

Primary care physicians are often the first point of contact for individuals experiencing depressive symptoms. They conduct initial assessments, including physical exams and medical history interviews to rule out certain conditions.

Psychiatrists are specialists in diagnosing and treating a range of mental health disorders, including MDD. They conduct a more comprehensive psychiatric assessment, using tools to assess symptom severity. Psychiatrists can also prescribe medications, which serve as pharmacological treatments.

Similar to psychiatrists, clinical psychologists or licensed therapists are also qualified to make a formal diagnosis of MDD in the U.S. These specialists focus on providing psychotherapy to clients to help them cope with and recover from their symptoms.

Treatment Options for Major Depressive Disorder

There are several standardized treatment options in which individuals can discover relief from their distress. Here are some of the most effective treatments for MDD.

Psychotherapy

With depression, the intention is to raise individuals’ level of motivation and arousal to engage in areas of life that previously brought joy. This can be accomplished using several therapeutic modalities tailored for depressive symptom reduction.

Cognitive Behavioral Therapy

Cognitive Behavioral Therapy (CBT) is a form of behavioral therapy that focuses on identifying and changing negative thought patterns and behaviors that contribute to depression.

Common techniques used in CBT treatment include:

Similar to other forms of behavioral therapy, CBT works to help you manage and cope with symptoms of MDD more effectively, giving you back the strength to take control of your life.

Interpersonal Therapy 

Interpersonal Therapy IPT is a form of relational therapy that focuses on improving interpersonal relationships and social functioning.

It helps individuals cope with symptoms of depression by addressing issues such as unresolved grief, challenging role transitions, and interpersonal conflicts, thereby enhancing communication skills and relationship patterns.

Psychodynamic Therapy

Psychodynamic therapy is a humanistic approach that takes into account the influence of early experiences and unconscious processes on current behavior.

It is useful in treating depression as it helps individuals gain insight into unresolved conflicts and emotional patterns, fostering deeper self-understanding and healing.

Medication

Antidepressants are a highly validated treatment option for major depression. Selective serotonin reuptake inhibitors (SSRIs) are frequent options for the treatment of depression.

Other common psychotherapy options include serotonin-norepinephrine reuptake inhibitors (SNRIs) and tricyclics.

That being said, there are certain side effects to consider with any medication, which is why it’s key that you discuss medication options at length with your qualified provider before making decisions.

Lifestyle Modifications

Like many other forms of depression—such as persistent depressive disorder, postpartum depression, and even seasonal affective disorder—the symptom severity of major depression can be modified with several lifestyle changes.

Regular physical activity is shown to be highly beneficial for individuals suffering from MDD as a way to boost mood, increase energy, increase levels of feel-good endorphins, such as serotonin, and lead to more favorable outcomes.

Similarly, diet can also significantly impact our mental health. Harvard Health encourages a balanced diet rich in colorful fruits and vegetables, whole grains, and lean proteins to improve brain function and regulate mood.

Lastly, maintaining good sleep hygiene is a central way to improve mental wellness. Research notes that sleep duration is an important aspect, as too much and too little can both increase the risk of depression.

Alternative Approaches

Beyond the more traditional avenues for MDD treatment, researchers have also considered several alternative options that have shown promise in alleviating symptoms and improving overall well-being.

These include:

These innovative approaches offer new ways to manage depression, giving individuals hope for their future.

Ways Therapy Can Help with Major Depression

Therapy is an effective treatment that has been proven to alleviate the suffering caused by depressive episodes, and help those individuals who experience depression get back on track with their social lives, relationships, careers, and schooling endeavors.

Psychotherapeutic interventions can help with:

Therapy is meant to offer a pathway to understanding and managing one’s emotions and behaviors.

Finding Support

Have you been considering reaching out for support? Consider Grow Therapy.

Offering comprehensive mental health care, Grow Therapy has licensed mental health professionals with expertise in providing effective support for major depression, ensuring personalized and empathetic care to help you navigate your journey to wellness.

FAQs

  • People living with Major Depressive Disorder may be generally sad or have a loss of interest in activities, they might withdraw from people or show low daily energy levels. While they may not want to admit that they feel depressed, or not even know that depression is what they are feeling, it is important to consider the symptoms involved in MDD to effectively support them.

  • Some of the more common forms of depression treatment include a combination of psychotherapy, such as CBT or other behavioral therapies, IPT, or psychodynamic therapy, as well as antidepressant medications, lifestyle changes, and support groups.

  • Yes, MDD is considered a chronic illness because it tends to recur over the course of a person’s lifetime. Though some individuals experience a single episode, those diagnosed with MDD tend to have recurrent episodes that, without treatment, impact their quality of life.

  • If you are experiencing persistent thoughts of death or self-harm or have any concerns about your ability to stay safe, please go to your nearest emergency room or contact a crisis lifeline. 9-8-8 Suicide Lifeline is one of many available 24/7.

About the author
Taylor Stranaghan Taylor Stranaghan

Taylor is a writer dedicated to exploring various layers of mental wellness, mindfulness, and personal growth. With a background in clinical research and pursuit of a Master’s in Counselling Psychology, she is passionate about crafting engaging content to empower and uplift individuals navigating their unique mental health journeys.

This article is not meant to be a replacement for medical advice. We recommend speaking with a therapist for personalized information about your mental health. If you don’t currently have a therapist, we can connect you with one who can offer support and address any questions or concerns. If you or your child is experiencing a medical emergency, is considering harming themselves or others, or is otherwise in imminent danger, you should dial 9-1-1 and/or go to the nearest emergency room.

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