The symptoms of depression can be complex and vary widely between individuals and may persist for weeks or even months.4 Depression manifests as a combination of three symptom groups: emotional, cognitive and physical.3
Emotional symptoms - The emotional symptoms such as sadness, feelings of hopelessness and anxiety are perhaps those traditionally most associated with depression.3
Physical symptoms - Physical symptoms of depression are wide ranging and can involve problems with sleep, appetite and weight changes, sexual dysfunction and headaches.3
Cognitive symptoms - Cognitive symptoms can affect decision-making, concentration and the ability to think.3 Research has also noted that cognitive symptoms, such as trouble concentrating, forgetfulness, or indecisiveness appear up to 94% of the time (n=267) during depressive episodes.5 Even in patients thought to be in remission, cognitive symptoms were present for an average of 39−44% of the time (n=267).5
At its most serious, depression can lead to suicidal thoughts and self-harm.2