Depression is a common psychological disorder. According to a data from Hospital Authority, 300, 000 people are suffering from depression. People experiencing depression will feel low mood which lasts few weeks to few months, cognition becomes negative, lost interest and lack motivation, this affects daily functioning.
The field of psychology and psychiatry commonly believe that depression is caused by the effect of physical factors, psychological factors and environmental factors, these include neurotransmitter malfunction, family inheritance (physical), cognitive distortion (psychological) and daily stress (environmental) etc.
Tiredness, insomnia/hypersomnia, weight gain/weight loss, irritable, increased/decreased appetite
Negative feelings and thoughts, such as feeling guilty, feeling useless. Believe the situation will become worse, hopelessness, suicidal thoughts
Acting differently compared to the past, e.g. losing interest in activities, acting or speaking slow, avoidance