There are a lot of signs of depression, but you may not have them all. How intense they are, and how long they last, are different from person to person. Some of the ways you might feel are:
SAD / EMPTY
Sad and empty feelings. It will continue over time without getting better or going away.
HELPLESSNESS / WORTHLESSNESS / GUILTY
You may feel bad about yourself or your life, or think a lot about losses or failures.
You may be pessimistic or believe that nothing good will ever happen. You may even think about suicide.
You may get restless or more cranky than usual.
LOSS OF INTEREST
Hobbies or games you usually enjoy may not appeal to you. You may have little or no desire to eat or have sex.
You may feel extremely tired or think more slowly. Daily routines and tasks may seem too hard to manage.
It could be tough to focus. Simple things like reading a newspaper or watching TV may be hard. You may have trouble remembering details. It might seem overwhelming to make a decision, whether it's big or small.
You may wake up too early or have trouble falling asleep. The opposite can also happen. You may sleep much longer than usual.
You may overeat or not feel hungry. Depression often leads to weight gain or weight loss.
ACHES & PAINS
You may have headaches, cramps, an upset stomach, or digestive problems.