In major depressive disorder, symptoms persist for at least two weeks, cluster into a recognizable pattern, and cause significant distress or impairment in general life routine. Depression is not a sad phase that lifts after a good night's sleep or a change in habits.
Many people living with it are told to "push through" or "think positively." That advice does not treat a neurobiological illness.
What are the Core Symptoms of Major Depressive Disorder?
The DSM-5 diagnostic criteria require at least five of the following symptoms to be present during the same two-week period, with at least one being either depressed mood or loss of interest. What makes this tricky is that not every person's depression looks the same. Some people cry constantly. Others feel completely numb. Some sleep twelve hours a day; others cannot sleep at all.
Persistent Low Mood
Feeling sad, empty, or hopeless most of the day, nearly every day. For children and adolescents, this often presents as irritability rather than sadness.
Loss of Interest or Pleasure
Known clinically as anhedonia, this is the inability to feel enjoyment in activities that once felt rewarding.
Changes in Appetite and Weight
Significant weight loss or gain unrelated to dieting, or a marked decrease or increase in appetite that persists over weeks.
Sleep Disturbances
The person might face either persistent insomnia (especially early morning waking) or hypersomnia.
Physical Symptoms
Depression is not just emotional. It also shows up as physical pain like muscle aches, fatigue, digestive issues, and back pain.
Some other lesser-known symptoms of depression include:
Extreme mood swings
Changes in sleep habits, like oversleeping or sleep deprivation
Feeling of exhaustion and fatigue
Difficulty concentrating on tasks
Loss of motivation
Who Gets Major Depressive Disorder: Risk Factors and Vulnerable Groups
There are some factors that make people more vulnerable to depression.
Two groups worth highlighting specifically: men and new mothers. Men are significantly underdiagnosed because their symptoms often show up as irritability, risk-taking, and substance use rather than visible sadness.
For new mothers, postpartum depression is a well-documented clinical presentation that requires its own treatment framework.
How Major Depressive Disorder Is Diagnosed
Major Depressive Disorder is diagnosed through a clinical mental health disorder that requires a structured interview, standardized assessment tools, and careful ruling out of other potential causes.
A trained professional (general practitioner, psychiatrist, or psychologist) conducts:
Clinical interview
Mental status examination
Physical exam
Medical history review
Screening questionnaires
Chronic major depressive disorder is diagnosed when symptoms persist for many years.
Treatment for Major Depressive Disorder
According to the statistics, between 70% to 90% of people with depression get treated. The challenge is that finding the right combination often takes time, and progress is slow as well.
Psychotherapy
Talk therapy is a first-line treatment for mild to moderate depression.
Cognitive Behavioral Therapy (CBT): Addresses the patterns of thought and behavior that maintain depression.
Behavioral Activation: A structured approach to re-engaging with rewarding activities.
Mindfulness-Based Cognitive Therapy (MBCT): Particularly effective at reducing relapse risk in people who have had three or more depressive episodes.
Antidepressant Medication
Medication is not the only answer, but for many people, it is an important part of it. Selective serotonin reuptake inhibitors (SSRIs) are the most commonly prescribed first-line pharmacological treatment for MDD. It typically takes four to six weeks to show a meaningful effect.
Combination Treatment
Rather than choosing just one option from therapy or medication for treating depression, it is better to go for a combination approach.
Lifestyle Adjustments
These are not replacements for clinical care, but they are meaningful contributors to recovery. Regular aerobic exercise, sleep regulation, dietary improvements, and reducing social isolation are the best behavioural approaches to minimize symptoms of depression on your own.
Consult with a Professional Therapist to Treat Depression
At Boston Neurobehavioral Associates (BNBA), our clinicians specialize in evidence-based treatment for depression. We offer online therapy for depression through a telehealth service. For people who prefer the flexibility of virtual care or who live outside of the Boston area, our online therapy for depression program can help.
Schedule your appointment with BNBA today and take the first step to get long-lasting treatment.