Major depressive disorder is a widespread and significant mental condition marked by ongoing sadness, a sense of despair, and reduced enjoyment or motivation for activities that were previously pleasurable. It influences a person’s emotions, thinking patterns, and ability to manage everyday responsibilities. Common signs may involve shifts in eating habits and body weight, trouble sleeping or sleeping too much, low energy levels, problems with focus, feelings of low self-value or intense guilt, and recurring thoughts about death or self-harm. Although the precise origin of depression is not completely known, experts believe it develops due to a mix of inherited traits, biological processes, environmental influences, and psychological elements.