I don't know what I want in life. I don't know what I want right now. All I know is that I'm hurting so much inside that it's eating me, and one day, there won't be any of me left ~ Unknown
Depression usually isn't caused by one event or reason, but is usually the result of several factors. Causes vary from person to person. Depression can be caused by lowered levels of neurotransmitters (chemicals that carry signals through the nervous system) in the brain, which limits a person's ability to feel good. Serotonin is a neurotransmitter that plays an important role in the biochemistry of depression, bipolar disorder and anxiety disorders. This neurotransmitter regulates the onset of sleep, sensory perception, mood, body temperature, hyperacusis (sensitivity to sound) and photophobia (light sensitivity). Low serotonin is associated with increased carbohydrate cravings, depression, pain, tenderness, and restless sleep. Prolonged stress consumes the levels of serotonin and can cause mood disorders, anxiety disorders, or migraine. Stimulants such as caffeine, refined carbohydrates, chocolate, sugar and stimulants such as cold remedies, alcohol, drugs, diet pills, and tobacco can also lead to reduced levels of serotonin in the brain. In the case of mood disorders, anxiety disorders or migraine, a combination of antidepressants and other prescription drugs. The long-term use of these medications can cause serotonin syndrome.