According to the DSM-5, a major depressive episode is a period marked by at least symptoms of depression and lasting for weeks or more.

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Explanation:

Based on the DSM 5, some symptoms must be present for criteria to diagnose a depressive disorder:

Generally speaking, a first sign is the loss of pleasure in daily activities or things that previously were preferred by someone.

Lacking interest in things will also often manifest in changes in eating and sleeping patterns:

Either sleeping too much or eating much or little will tend to express as depressive signs.

Being irritable during most of the day and at all time is also a sign that people are suffering from depression.

Then a loss of energy to carry on with life and noticing in small activities can also signal for a major depressive disorder.

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