Depression is an illness caused by a change in your brain chemistry. Getting to the point of depression also has many other contributing factors like genetics, medical conditions, stress and hormone levels, and life circumstances.
If you are having serious feelings of sadness or guilt, hopelessness, and mood swings, this may be linked to depression. Outbursts of anger and a loss of interest in things you used to cherish or be passionate about, such as family friends, hobbies, and activities, are also symptoms of depression. As well as having trouble concentrating, remembering or even thoughts of harming yourself, depression symptoms may also cross over into physical problems, such as a lack of energy, weight loss or gain, aches and pains and changes in sleep.
To treat depression, a healthcare professional will have to determine your particular depression characteristics then they will be able to prescribe psychotherapy or medication. A change in lifestyle and reducing stress also help a great deal.
Depression is often never diagnosed, or treated, but it is very manageable, especially when treated in the early stages.