Unfortunately, many people with depression still suffer in silence, perhaps because they do not recognize the symptoms of depression or because they can not afford medical treatment.
Although the list is quite comprehensive, there may be symptoms that you feel are not listed, this does not mean that you are more ill or suffering from something else, we are all biologically different in many ways and some people just react differently during a depression.
In depression are checked mood swings by gravity and persistence of symptoms. It is associated often anxiety or panic attacks.
The following list of symptoms of depression includes the most common reported by people with depression.
Appetite change (lack or excess of appetite)
Sleep disturbances (drowsiness or insomnia)
Fatigue, tiredness and loss of energy
Feelings of worthlessness
Lack of confidence and self-esteem
Feelings of guilt and feelings of inadequacy
Lack or concentration changes
Concern about the meaning of life and death
Indifference, apathy and sadness
Changes in sexual desire
Irritability
Manifestation of physical symptoms such as muscle pain, abdominal pain, nausea.
Usually a depressed patient close the door to the world and loses all interest in life ending up by isolating all those around him, even his own family.

Whatever the symptoms, depression is different from normal sadness in living the day-by-day, interfering with their ability to work, study, eat, sleep and have fun. Feelings of helplessness, hopelessness and worthlessness are intense and relentless, with little or no relief.
Symptoms may have influence on us in different ways, the psychological, physical and social level, see some examples:
Psychological
Sadness and dismay
Loss of interest
Lack of pleasure
Lack of concentration
Feelings of hopelessness
Lack of motivation
Thoughts about death
Anxiety and worry
Suicidal ideas
Depression can be treated effectively if you take the right steps:
Dont wait the depression to go away.
Get evaluation and treatment.
Do what you can to take care of yourself.
Physical
Social
Difficulties at home
Problems in the family
Profissional performance
Reduction of interest
Avoid social contact
Reduced participation in activities

Tiredness and lack of energy
Cry
Sleep disturbances
Digestive problems
Reduced libido
Changes in menstrual cycle
Changes in appetite
Unexplained aches and ardor
The treatment for depression may include psychotherapy, medicines or a combination of both. Sometimes, therapists might recommend daily exercise, exposure to daylight or better ways of eating. A therapist can teach relaxation techniques to help someone get a good night's sleep. All these things can improve the production of neurotransmitters in the brain.
Depression varies from person to person, but there are some common signs and symptoms. Remember that these symptoms may be part of normal ups and downs of life. But the more symptoms you have, the stronger they are and the longer they last the more likely may be a sign that you are dealing with depression. When these symptoms are overwhelming and disabling, that's when it's time to seek help.
"The strongest association between psychological factors and physical conditions was with depression."