While it's normal to feel tired occasionally, if you feel tired every day, it may be a sign of depression.
Feeling tired all the time:
Irritability is a common symptom of depression. You may find yourself easily annoyed or frustrated with people or situations.
Feeling irritable:
High-functioning depression can cause excessive worry & anxiety. You may find yourself worrying about things that are not normally a concern, or feeling anxious without a clear reason.
Constant worrying:
Depression can affect your ability to concentrate and make decisions. You may find it hard to focus on tasks, even simple ones.
Difficulty concentrating:
People with high-functioning depression may continue to carry out their daily responsibilities, but they may neglect their own self-care.
Neglecting self-care:
People with high-functioning depression may turn to unhealthy coping mechanisms to deal with their symptoms.
Using unhealthy coping:
Depression can make you feel isolated & disconnected from others, even if you're surrounded by people.