Health A-Z


Depression overview

We all have the blues from time to time, but if you have depression, this feeling is stronger, it affects your thinking and behaviour, and lasts from weeks to months. However, no matter how low you feel, there is hope. There are people who can help you and things you can do to get on the road to recovery.

Key points

  • Depression is very common and can affect anyone, at any age – from childhood through to old age. It’s not a sign of any kind of weakness or fault in you.
  • About 1 in 6 people experience depression at some time in their life. It affects women more than men, but men seem less likely to recognise the problem and seek help.
  • Key symptoms include constantly feeling down or hopeless, loss of enjoyment or interest in doing the things you used to enjoy doing, negative thinking and sleep problems. You may even feel so bad that you have thoughts of self-harm or even suicide.
  • Symptoms can range from mild to severe, and the support and treatment you need will depend on how severe your symptoms are.
  • Depression can usually be treated with a combination of psychological therapies, lifestyle changes and antidepressant medication.
  • If you’re depressed, it’s important to get help – the sooner you do, the sooner you'll start to feel better. Remember: there is hope. Many people have come out the other side of depression and have gone on to enjoy happy, healthy lives.

What are the symptoms of depression?

Depression is a change in mood, behaviour and feelings that can be mild, moderate or severe. Symptoms include:

  • low mood
  • frequently feeling sad and tearful
  • not wanting to socialise anymore
  • being unable to enjoy activities that once were fun
  • poor appetite or overeating
  • physical symptoms such as pain (eg, headache, back pain)
  • tiredness and too much or too little sleep
  • difficulty concentrating and making decisions
  • difficulty getting much done.

If your depression is more severe, you may also have thoughts of self-harm or suicide. If you have these thoughts, you should get help urgently from your doctor or one of the helplines listed on this page. There are people who can help you get through. Read more about severe depression.

What causes depression?

Sometimes depression appears out of the blue, while at other times something seems to trigger it. The exact cause of depression is unknown but many factors may play a role in depression. For example, you are more likely to experience depression if you:

  • have someone in your family who has been depressed, such as a parent or sibling
  • experienced trauma or abuse at an early age
  • have certain chronic physical health conditions, such as diabetes, cancer, heart disease, Parkinson’s disease or coeliac disease, or have had a stroke or have low thyroid hormone
  • are going through major life changes or have recently suffered a loss, such as a relationship break-up, redundancy, or a significant injury or accident
  • are LGBTI
  • are or have just been pregnant
  • are an older adult
  • use alcohol or recreational drugs
  • are taking certain medicines, such as for blood pressure or hormonal medication.

How is depression diagnosed?

If you are unsure whether you have depression, there are online self-tests you can do, including:

If you have some, but not necessarily all, the symptoms mentioned above, it’s a good idea to see your doctor. They will ask you questions about your thoughts, feelings and behaviour, including sleeping and eating patterns, as well as how long you have been feeling this way. They will also ask if you have had any previous episodes of depression and may ask about what is happening in your life at the moment. They may also do a physical examination and blood tests to rule out other causes for your depression.

Your doctor will be assessing not only if you have depression, but what type of depression and whether you have mild, moderate or severe symptoms, as this will affect what treatment they recommend.

What are the different types of depression?

There are several types of depression. You can still be depressed even if you don't meet all the criteria for one of these types. They include:

Major depressive disorder – severe symptoms that interfere with your ability to work, sleep, study, eat and enjoy life. 
Persistent depressive disorder – a depressed mood that lasts for at least 2 years. 
Psychotic depression severe depression plus some form of psychosis.
Postpartum depression a type of depression that some women experience after giving birth. 
Seasonal affective disorder (SAD)  depression during the winter months, when there is less natural sunlight.
Bipolar disorder  different from depression, but includes episodes of extreme low moods well as extreme high moods (mania).

How is depression treated?

Depression can usually be effectively treated with a combination of psychological therapy, lifestyle changes and antidepressant medication. For some people, alternative approaches have been useful, such as mindfulness meditation, St John's wort and online tools and courses. Find out more about treatment for depression.

What self-care can I do if I’m depressed?

  • Small steps are the key to change – choose what feels manageable and build from there.
  • Making your own self-care matter builds your resilience so you can cope better with the challenges of life.
  • Looking after your physical health helps your mental wellbeing.
  • Having ways to reduce and manage stress increases your resilience.
  • Getting help when you need it is a sign of strength not weakness.
  • Staying connected to family, whānau and friends can help you feel better.
  • Spending time in nature is key to your wellbeing.
  • Finding a purpose increases your sense of meaning and belonging.

Read more about Living well with depression.


If you would like to talk to someone, try one of the following free helplines as a first step, or contact your doctor.

  • 1737 phone or text 24/7 to reach a trained counsellor
  • Depression Helpline (0800 111 757)
  • Lifeline (0800 543 354)
  • Samaritans (0800 726 666)
  • Youthline (0800 376 633)

See more support options. 

Learn more

The following links provide further information about depression. Be aware that websites from other countries may have information that differs from New Zealand recommendations. information, tests, tools, videos and more
Depression Mental Health Foundation, NZ
The lowdown – for young people NZ
Depression explained Black Dog Institute, Australia
Depression Your Health in Mind, Royal Australian and New Zealand College of Psychiatrists 2017
Resources for women with depression Through Blue, NZ
Workplace wellbeing Mental Health Foundation, NZ
Other peoples stories
Personal stories Mental Health Foundation

See more resources about depression and how to manage it.


  1. Depression – what you need to know National Institute of Mental Health, US
  2. Depression in the LGBT population Healthline, US, 2016
  3. Online insomnia treatment also prevents depression Black Dog Institute, Australia, 2016
  4. One hour of exercise a week can prevent depression Black Dog Institute, Australia, 2017
  5. Dipnall JF, Pasco JA, Berk M, Williams LJ, Dodd S, Jacka FN,Meyer D2.Getting RID of the blues: Formulating a risk index for depression (RID) using structural equation modelling. Aust N Z J Psychiatry. 2017 Aug 1.
  6. Depression Mental health Foundation, NZ, 2014
  7. Mindfulness holds promise for treating depression American Psychological Association, 2015

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Source: Health Navigator