Know that depression doesn't necessarily involve feeling sad. Many people with depression feel empty, guilty, or irritable.
[header] How to tell if your relationship makes you depressed [title] Be aware of your moods. [step] Notice how you feel throughout the day. Do some situations make you feel cheerful and energetic, or do you feel down much of the time? [substeps] Depression can creep up on you slowly, so it's important to be aware of whether your overall mood has changed over time.