According to "HealthLine" 

Causes of depression

Many factors result in depression. They can range from biological to circumstantial.

Popular causes include:

1. Brain structure

There’s a higher risk for depression if the frontal lobe of your brain is lowly active. However, scientists don’t know if this occurs before or after the onset of depressive symptoms.

2. Pain

People who feel emotional or chronic physical pain for a long time are typically more likely to have depression.

3. Hormone levels

Changes in female hormones estrogen and progesterone when a variety of periods like when the menstrual cycle, postpartum period, perimenopause, or menopause may all increase a person’s risk for depression.

4. Family history

You’re at a higher risk for experiencing depression if you have a family history of depression or some other mood disorder.

5. Early childhood trauma

Some activities affect the way your body reacts to fear and stressful conditions.

6. Medical conditions

Specific situations may cast you at higher risk, like chronic illness, insomnia, chronic pain, Parkinson’s disease, stroke, heart attack, and cancer.

7. Substance use

A history of substance or alcohol misuse can be harmful and put at greater risk.

8. Brain chemistry

There is normally a chemical imbalance in parts of the brain that controls mood, thoughts, sleep, appetite, and behaviour in persons who experience depression.

Have a serious check on yourself if you notice any of the listed causes above.

Thanks for reading,