Depression is said to be caused by hormonal imbalances. While everyone has downs in life if depression is persistent it is time to seek a doctor's help. It may also be time to take a second look at your prescription medications. Sometimes medications prescribed for heart problems, glaucoma and high blood pressure can also cause chemical and hormonal imbalances. Depression, fatigue and loss of interest in daily activities, can be a side effect of these medications. It is important to make an inventory of all your medications and inform your doctor. Sometimes a simple change in medication can cause an upliftment in mood.
Depression comes in various forms - from mild to severe. Some types of depression are associated with seasonal changes. SAD or Seasonal affective disorder is usually brought on by winter when there is lack of sunshine. Going out into the sunshine and light therapy are greatly beneficial in such types of depression.
More information on depression forms, symptoms and treatment