Depression has eight main symptoms. The more symptoms you have (usually five or more), the stronger they are, and the longer they’ve lasted — the more likely it is that you’re dealing with depression. The symptoms of depression are:
Feeling sad, anxious or bored
Low energy, feeling tired or fatigued
Under-sleeping or over-sleeping, waking frequently during the night
Poor concentration, thinking slowed down
Loss of interest in hobbies, family or social life
Low self-esteem and feelings of guilt
Aches and pains with no physical basis, e.g. chest, head or tummy pain  associated with anxiety or stress
Loss of interest in living, thinking about death, suicidal thoughts