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If Mr. F went to the doctor, he would notice that depression is a mental disorder which has been thoroughly studied and that it requires a treatment, like a person with asthma or hypertension.
He would understand that unless he does something to control it, his physical health will get worse. Scientific studies have proved that people suffering from severe depression become more prone have diabetes or heart attacks.
Mr F has been absent from work many times as he felt some lack of energy, his body was stiff and he became distracted easily. He told his workmates that he got a back injury when training in the gym. It is easier to understand a muscle pain than a mental disorder.
However, his depression is tangible. If he had a tomography done, he could see what is happening inside his brain.
There are changes which can be seen in the lower part of the frontal lobes and in the hippocampus of someone who is experiencing depression. The hippocampus is the area of the brain that enables learning and memory development.
In a microscopic scale, depression is related to many factors: an imbalance of certain chemical compounds that are released by the neurons, mainly serotonin, norepinephrine and dopamine; alterations of circadian rhythms or sleep-wake cycles and hormone disorders, such as the increase of the levels of cortisol, which is the stress hormone.
If Mr. F was not depressed, his cortisol levels would be normal and he would wake up in the morning with vitality, like most people do.
But something is not working properly. He experiences a feeling of shock at any moment with the smallest stimulus. This situation lasts until the end of the day. According to the World Health Organization (WHO), if we do not do anything about this, depression will be the first cause of disability in the world by 2030.