Depression

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The symptoms of depression can be complex and vary widely between people. But as a general rule, if you are depressed, you feel sad, hopeless and lose interest in things you used to enjoy.
The symptoms persist for weeks or months and are bad enough to interfere with your work, social life and family life.
There are many other symptoms of depression and you're unlikely to have every one listed below.

If you experience some of these symptoms for most of the day, every day for more than two weeks, you should seek help from your GP.

Psychological symptoms include:

• continuous low mood or sadness
• feeling hopeless and helpless
• having low self-esteem
• feeling tearful
• feeling guilt-ridden
• feeling irritable and intolerant of others
• having no motivation or interest in things
• finding it difficult to make decisions
• not getting any enjoyment out of life
• having suicidal thoughts or thoughts of harming yourself
• feeling anxious or worried
• Physical symptoms include:
• Moving or speaking more slowly than usual
• change in appetite or weight (usually decreased, but sometimes increased)
• constipation
• unexplained aches and pains
• lack of energy or lack of interest in sex
• changes to your menstrual cycle
• disturbed sleep (for example, finding it hard to fall asleep at night or waking up very early in the morning)
• Social symptoms include:
• not doing well at work
• taking part in fewer social activities and avoiding contact with friends
• neglecting your hobbies and interests
• having difficulties in your home and family life
  

Depression can come on gradually and so it can be difficult to notice that something is wrong. Many people continue to try to cope with their symptoms without realising they are ill. It can take a friend or family member to suggest that something is wrong.
Doctors describe depression by how serious it is.
Mild depression has some impact on your daily life.
Moderate depression has a significant impact on your daily life.
Severe depression makes it almost impossible to get through daily life. A few people with severe depression may have psychotic symptoms.

NICE recommended treatments for Depression include CBT, IPT, Counselling For Depression, Couple Therapy for Depression and Counselling

Grief and Depression

It can be hard to distinguish between grief and depression. They share many of the same characteristics, but there are important differences between them.
Grief is an entirely natural response to a loss, while depression is an illness.
People who are grieving find their feelings of loss and sadness come and go, but they're still able to enjoy things and look forward to the future.
In contrast, people who are depressed have a constant feeling of sadness. They don't enjoy anything and find it hard to be positive about the future.

Other types of Depression

There are different types of depression, and some conditions where depression may be one of the symptoms. These include:
Postnatal depression. Some women develop depression after having a baby. Postnatal depression is treated in similar ways to other forms of depression, with talking therapies and antidepressant medicines.
Bipolar disorder  are spells of depression and also of excessively high mood (mania). The depression symptoms are similar to clinical depression, but the bouts of mania can include harmful behaviour such as gambling, going on spending sprees and having unsafe sex.
Seasonal affective disorder (SAD). Also known as 'winter depression', SAD is a type of depression that has a seasonal pattern usually related to winter.
Ref NHS Choices