Depression is caused by a number of influencers including genetic, psychological and environmental factors. .
There's no single cause for depression. The illness often runs in families. Experts believe a genetic vulnerability combined with environmental factors, such as stress or physical illness, may cause an imbalance in brain chemicals called neurotransmitters, resulting in depression. Imbalances in three neurotransmitters " serotonin, norepinephrine and dopamine " seem to be linked to depression. Scientists don't fully understand how imbalances in neurotransmitters cause signs and symptoms of depression. It's not certain whether changes in neurotransmitters are a cause or a result of depression. Also In recent years, researchers have shown that physical changes in the body can be followed by mental changes as well. Medical illnesses such as stroke, a heart attack, cancer, Parkinson's disease, and hormonal disorders can cause depressive illness, making the sick person not wanting to care for his or her physical needs, making the recovery period slower. Also, a serious loss, difficult relationship, financial problem, or any stressful change in life patterns can cause a depressive episode. A lot of times a combination of genetic, psychological, and environmental factors is involved in the start of a depressive disorder. Later episodes of illness typically brought out by only mild stresses, or none at all. Two types of depression are Clinical Depression and Manic Depression.
Manic depression describes two different mood swings and manic depression is also known as bipolar disorder. People that suffer from manic depression go at least a week on very high manic episodes followed by very low depression episodes. Rarely in the normal range for long, those with manic depression go back and forth between these two extreme moods. Like other depression disorders, manic depression is influenced by heredity and physical chemistry along with certain personality traits.
