Key facts
- Depression (major depressive disorder) is one of the most common mental health conditions worldwide.
- It is not a sign of weakness, and it is not something you can simply "snap out of."
- The core treatments are psychotherapy, medication, or both, and they work for most people.
- Symptoms lasting two weeks or more are a reason to talk to a professional.
What is depression?
Depression is a mood disorder that causes a persistent feeling of sadness, emptiness, or loss of interest, along with physical and cognitive changes that interfere with daily life. Everyone feels down at times, but depression is different: the low mood lasts for weeks or longer and affects work, relationships, sleep, appetite, and the ability to enjoy things you used to.
It is a real medical condition with biological, psychological, and social causes, not a character flaw. The encouraging part is that depression is highly treatable.
Symptoms
Depression looks different from person to person, but common signs include:
- Persistent sad, anxious, or "empty" mood
- Loss of interest or pleasure in activities you used to enjoy
- Changes in appetite or weight
- Sleeping too much or too little
- Fatigue or low energy
- Difficulty concentrating, remembering, or making decisions
- Feelings of worthlessness, hopelessness, or excessive guilt
- Restlessness or feeling slowed down
- Physical aches or pains with no clear cause
- Thoughts of death or suicide
A diagnosis of major depression generally involves several of these symptoms present for at least two weeks.
Types of depression
- Major depressive disorder: episodes of intense symptoms that last two weeks or more.
- Persistent depressive disorder (dysthymia): a lower-grade depression that lasts two years or longer.
- Seasonal affective disorder: depression that follows a seasonal pattern, often in winter. See our guide to seasonal affective disorder.
- Postpartum depression: depression during pregnancy or after birth. See postpartum depression.
- Bipolar depression: depressive episodes that are part of bipolar disorder.
Causes and risk factors
There is no single cause. Depression usually results from a combination of factors:
- Biology: brain chemistry, hormones, and genetics. Depression can run in families.
- Life events: trauma, loss, chronic stress, or major change.
- Health: chronic illness, chronic pain, and some medications can contribute.
- Substance use: alcohol and drug use can trigger or worsen depression.
How depression is treated
Depression is one of the most treatable mental health conditions. Most people respond well to treatment, and a combination often works best.
Psychotherapy
Talk therapy, particularly cognitive behavioral therapy (CBT) and interpersonal therapy, helps you identify and change the thoughts and patterns that fuel depression. For many people it is as effective as medication, and the benefits can last.
Medication
Antidepressants can help correct the brain chemistry involved in depression. They take a few weeks to work and should always be managed by a prescriber. Learn more about antidepressants.
Lifestyle and self-care
Regular physical activity, consistent sleep, social connection, and limiting alcohol all support recovery. These complement, but do not replace, professional treatment for moderate to severe depression.
When to seek help
Reach out to a doctor or mental health professional if low mood, loss of interest, or other symptoms last more than two weeks or get in the way of daily life. Seek help immediately if you have thoughts of harming yourself. Depression is treatable, and getting help early makes recovery easier.
Frequently asked questions
Can depression go away on its own?
Mild symptoms sometimes ease with time and self-care, but moderate to severe depression usually needs treatment. Waiting can prolong suffering, so it is worth talking to a professional.
Is depression the same as feeling sad?
No. Sadness is a normal emotion that passes. Depression is a persistent condition that affects mood, body, and thinking for weeks or longer and interferes with daily life.
How long does treatment take?
Many people start to feel better within weeks of beginning therapy or medication, though full recovery varies. Your provider can set expectations based on your situation.