No one knows for certain why people experience depression, but there are some risk factors that research suggests can increase the risk of depression. Such risk factors include:
- Genetic factors – those who have a family member with depression are of higher risk
- Biological factors – certain illnesses, such as chronic alcohol consumption, low thyroid levels, or brain injury, can lead to depression
- Environmental factors – long term struggles in life with financial, interpersonal relationships, and work problem may contribute to depression
- Personality factors – those who are easily anxious, have low self-esteem, or have had a rough childhood are more prone to the illness
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