Depression is more than feeling sad, unmotivated, or having a difficult week.
It is a mental health condition that can affect mood, energy, sleep, concentration, relationships, physical well-being, and the ability to manage everyday responsibilities. For some people, depression feels like persistent sadness. For others, it may feel more like numbness, irritability, exhaustion, hopelessness, or losing interest in things that once mattered.
The encouraging part is that depression is treatable. Psychotherapy, medication, and other forms of support can all play a role depending on the person, the severity of symptoms, previous treatment experiences, and individual preferences. CAMH notes that depression treatment may include counselling, individual or group therapy, medication, and other medical interventions depending on clinical need.
What Is Depression?
Depression, often called major depressive disorder or clinical depression, is a mood disorder that can affect how a person thinks, feels, behaves, and functions day to day.
It is different from ordinary sadness.
Sadness usually relates to a particular event or experience and often changes with time or circumstances. Depression tends to be more persistent and can begin affecting work, school, relationships, self-care, motivation, and physical functioning.
CAMH explains that a person may be experiencing depression when symptoms are present most days, persist for more than two weeks, and interfere with functioning at work, school, or in relationships.
What Are the Common Symptoms of Depression?
Depression can look different from one person to another. Someone may appear highly functional externally while struggling significantly internally.
Common symptoms can include:
- Persistent sadness, emptiness, or low mood
- Loss of interest or pleasure in activities
- Fatigue or noticeably reduced energy
- Sleeping too much or too little
- Changes in appetite or weight
- Difficulty concentrating or making decisions
- Irritability or restlessness
- Feelings of worthlessness, hopelessness, or excessive guilt
- Physical complaints such as headaches, stomach discomfort, or unexplained aches
- Feeling slowed down physically or mentally
- Withdrawing from friends, family, work, or hobbies
- Recurrent thoughts about death or suicide
CAMH identifies many of these as recognized symptoms of depression, while also emphasizing that severity and presentation vary from person to person.
Having one or two of these experiences does not automatically mean you have depression. Diagnosis should consider the overall pattern, duration, severity, impact on functioning, medical history, and other possible explanations.
Can Depression Look Like Irritability or Exhaustion Instead of Sadness?
Yes, Not everyone with depression describes themselves as sad.
Some people mainly notice that they are tired all the time, emotionally numb, easily irritated, unable to concentrate, less interested in relationships, or struggling to complete everyday tasks.
Others describe feeling disconnected from themselves or thinking:
“I know I should care, but I don’t.”
“I am doing everything I am supposed to do, but nothing feels rewarding.”
“Even simple tasks feel heavier than they used to.”
This is one reason depression can go unrecognized, especially in people who continue meeting work, school, or family responsibilities despite feeling increasingly depleted.
What Causes Depression?
There is no single cause of depression.
Current understanding is that depression can develop through interactions among genetic, biological, psychological, environmental, social, and health-related factors. CAMH specifically describes depression as resulting from combinations of genetic, biological, environmental, and psychological influences.
This is more accurate than explaining depression as simply a “chemical imbalance.”
Family History and Genetic Vulnerability
Having a close family member who has experienced major depression can increase risk.
That does not mean depression is inevitable. Family patterns may reflect a combination of genetic vulnerability, shared environments, early experiences, stress exposure, and other factors.
Stressful Life Events
Major life changes can contribute to depression for some people.
Relationship breakdown, financial strain, job loss, bereavement, migration, caregiving pressure, chronic stress, or major transitions can all affect emotional well-being.
Depression may sometimes emerge after one major event, while in other cases it develops after many smaller stressors accumulate over time.
Trauma and Difficult Earlier Experiences
Past trauma can increase vulnerability to depression.
This may include abuse, neglect, violence, serious accidents, displacement, or other deeply distressing experiences. Trauma does not automatically lead to depression, but it can influence emotional patterns, beliefs about the self, stress responses, and relationships.
Physical Health Conditions
Certain medical conditions can occur alongside depression or contribute to depressive symptoms.
CAMH notes that conditions including diabetes, cancer, heart disease, Parkinson’s disease, and chronic health problems can sometimes coincide with depression. Some medications may also contribute to mood changes.
This is why an appropriate medical assessment can matter, particularly when low mood or fatigue appears suddenly or alongside physical symptoms.
Is Depression Just a Chemical Imbalance?
No, Depression is much more complex than having “too little serotonin” or another single neurotransmitter problem.
Brain chemistry is involved in mood regulation, but depression cannot be reduced to one measurable chemical deficiency.
Genetics, stress, trauma, physical health, relationships, environment, behaviour, cognition, sleep, social circumstances, and many other factors can all contribute.
A more useful way to understand depression is as a multifactorial condition, which is also why treatment needs to be personalized rather than assuming the same intervention will work for everyone.
How Is Depression Diagnosed?
Depression should be assessed by an appropriate qualified health or mental-health professional rather than diagnosed from an online symptom list.
Assessment may include questions about mood, sleep, motivation, concentration, appetite, thoughts, functioning, medical history, substance use, stressful experiences, medications, and the duration and severity of symptoms.
Clinicians may also use standardized questionnaires such as the PHQ-9 to help assess symptoms and monitor changes over time. CAMH identifies tools such as the PHQ-9 as useful for screening, assessment, and tracking response to treatment.
A questionnaire by itself does not replace professional evaluation.
What Are the Main Treatment Options for Depression?
Treatment should be shaped around the person rather than around a single formula.
CAMH identifies both psychotherapy and medication as effective treatment options, with treatment choice depending in part on severity, clinical presentation, and individual circumstances.
Psychotherapy
Psychotherapy can help people understand patterns that contribute to depression, develop coping strategies, improve functioning, address relationship or life stressors, and work with thoughts and behaviours that may be maintaining symptoms.
The American Psychological Association recommends several evidence-based psychotherapy approaches for adults with depression, including cognitive behavioural therapy, behavioural therapy, cognitive therapy, interpersonal psychotherapy, supportive therapy, and certain forms of psychodynamic therapy.
Therapy is not simply about “thinking positively.”
It may involve understanding how thoughts, behaviours, avoidance, relationships, self-criticism, grief, stress, and past experiences interact with mood.
Medication
Antidepressant medication may also be recommended, particularly when depression is moderate to severe or when symptoms significantly affect daily functioning.
Medication decisions should be made with a physician, nurse practitioner, psychiatrist, or other qualified prescriber who can discuss benefits, risks, side effects, interactions, and treatment history.
CAMH notes that antidepressants are one treatment option and that medication and psychotherapy may sometimes be used together.
Psychotherapists at Nurturing Wellness do not prescribe medication, but therapy can complement medical care when medication forms part of a client’s treatment plan.
How Can Therapy Help With Depression?
Therapy can support depression treatment in several different ways.
A therapist may help you notice patterns such as withdrawing when your mood drops, interpreting situations through an increasingly negative lens, avoiding activities because they feel exhausting, becoming highly self-critical, or struggling to ask other people for help.
Those patterns can reinforce depression even when they originally developed as attempts to cope.
For example, depression may lead you to cancel plans because you feel exhausted. Spending less time with other people can then increase isolation. That isolation may reinforce thoughts such as:
“No one wants to hear from me.”
“I am becoming a burden.”
“There is no point trying.”
Therapy can help you notice those cycles and identify realistic ways to begin changing them.
What Is Cognitive Behavioural Therapy for Depression?
Cognitive Behavioural Therapy, or CBT, focuses on connections among thoughts, emotions, and behaviour.
For depression, CBT may help someone recognize patterns such as hopeless predictions, excessive self-blame, all-or-nothing thinking, or assumptions that reinforce withdrawal and low mood.
The goal is not to replace every negative thought with a positive one.
It is to examine whether particular thought patterns are accurate, useful, or maintaining distress, while also building healthier behaviours.
APA guidelines recommend CBT as one evidence-based psychotherapy option for adults with depression.
What Is Behavioural Activation?
Behavioural activation focuses on what happens when depression causes people to withdraw from meaningful or rewarding activities.
When energy and motivation are low, it is understandable to stop doing things.
But prolonged withdrawal can reduce opportunities for connection, accomplishment, pleasure, and routine.
Behavioural activation works gradually.
It may involve identifying manageable activities and routines that reconnect someone with things that matter to them rather than waiting for motivation to return first.
APA includes behavioural therapy among recommended interventions for adult depression.
Depression Therapy in Mississauga at Nurturing Wellness
If low mood, withdrawal, hopelessness, reduced motivation, or emotional heaviness is affecting daily life, Individual Therapy in Mississauga can provide a private setting to explore what you are experiencing and identify appropriate next steps.
Nurturing Wellness’s Individual Therapy service specifically includes depression among the concerns that can be addressed, with in-person sessions in Mississauga and virtual therapy options available.
For adults experiencing depression alongside anxiety, trauma, chronic pain, addiction, or body-based stress, Lilin Qiu, Registered Psychotherapist (Qualifying) works with adults experiencing depression and related concerns. Her profile identifies depression as one of the areas she supports, alongside trauma, anxiety, chronic pain, and addiction.
Nurturing Wellness also has therapists with different areas of experience, so fit should be based on your needs rather than assuming one therapist is right for everyone.
Meet the Nurturing Wellness therapy team
You Do Not Need to Wait Until Depression Feels Unmanageable
Depression can make help feel difficult to seek.
You may tell yourself you should be able to handle it.
You may believe other people need support more than you do.
You may think you need to wait until things become worse before therapy is justified.
You do not.
If your mood, energy, motivation, sleep, concentration, relationships, or daily functioning have changed in a way that concerns you, talking with a qualified professional can help you understand what is happening and what kind of support may be appropriate.
Depression is complex, but treatment options exist.
At Nurturing Wellness, therapy is approached collaboratively and shaped around the person’s concerns, history, goals, and comfort level rather than treating depression as a one-size-fits-all experience.
Explore Individual Therapy in Mississauga or book a consultation with Nurturing Wellness.
Frequently Asked Questions
Early signs can include persistent low mood, reduced enjoyment, lower energy, sleep changes, irritability, withdrawal, difficulty concentrating, or feeling less motivated than usual. The important factors are the overall pattern, how long symptoms last, and whether they begin interfering with everyday functioning.
Clinical assessment generally considers symptoms that persist most days for at least two weeks and interfere with functioning. Duration alone does not establish a diagnosis, so a qualified professional should consider severity, medical factors, history, and other possible causes.
Yes. Some people primarily experience numbness, irritability, exhaustion, lack of interest, difficulty concentrating, withdrawal, guilt, hopelessness, or physical symptoms rather than describing themselves as sad.
Evidence supports several forms of psychotherapy for depression, including CBT, behavioural approaches, interpersonal psychotherapy, supportive therapy, cognitive therapy, and some psychodynamic approaches. The appropriate treatment depends on age, severity, preferences, symptoms, and other individual factors.
No. Treatment varies. Some people use psychotherapy alone, some use medication, and others use both. CAMH notes that psychotherapy can be effective for mild to moderate depression, while medication or combined treatment may be considered depending on severity and clinical circumstances. Medication decisions should be made with an appropriate prescriber.
Stress does not automatically cause depression, but major life stress and difficult circumstances can contribute to risk for some people. Depression usually reflects an interaction among several biological, psychological, environmental, and social factors rather than one single cause.
Yes. Depression can affect sleep, appetite, energy, concentration, movement, and physical comfort. Some people experience headaches, stomach discomfort, or other aches alongside emotional symptoms. Medical assessment can also help rule out physical conditions that may produce similar symptoms.
Seek urgent support if you are thinking about suicide, have made a plan to harm yourself, or feel unable to stay safe. In Canada, call or text 9-8-8 for 24/7 suicide crisis support. If you are in immediate danger, call 9-1-1 or go to the nearest emergency department.
