How do you know if you are depressed, and not just sad?

Oh I don’t know that- When I’m feeling down and blue- I’m just sad- I don’t like the word depression- Makes me think of medicine and doctors- I think if your funk lasts for a long time- then you could classify it as depression- If you get the urge to do bad things then defiantly depression and seek a doctor for help! But if you are just sad- because your husband is gone, and you’re moving, and you are having a baby- plus your kids are giving you a hard time cuz they have cabin fever- then I’m thinking it’s sadness-- and worrying/stress. Cheer up!