According to the European ICD-10-Manual of Classification, we are talking about a depressive disturbance when the following criteria are fulfilled:

The patient has suffered for at least two weeks from at least 2 of the following 3 main symptoms:

• depressive mood
• Loss of interest and joy
• increased tiredness

In order to be able to make a clear diagnosis at least 2 of the following symptoms must be present:

• decreased ability to concentrate and pay attention
• decreased feelings of self value and self-assurance
• Feelings of guilt or worthlessness
• negative or pessimistic thoughts about the future
• Thoughts about suicide or attempted suicide
• Sleep disturbances
• decreased appetite