Why am I sad sometimes?

When I eat I sometimes get a really big pain in my heart, what is it? Btw I don't eat fast so it can't be indegestion.

lately i have been really busy and sort of depressed. and now i like being sad. Why is this so? And how do i get over this?

I get sad really often. I don't know why some of the times. I'll be happy and then suddenly become really sad and feel extrem...

Sometimes, my front teeth feel very loose, like if I push my tongue up against them. other times, they don't.. whats going on?

When I am going through PMS, I get really bad sadness, depression, and anger issues. They're really bad like, I can do someth...

I feel sad...but in a good way, does that make since and if so/ not why?

I've been having this same problem this other girl is I've been feeling so sad and gloomy but I dont know y?

why am I upset all the time. I cry for random reasons, sometimes no reason at all. I get upset so much & for such little thi...

okay I wanted advice because I'm always sad well I read them I presiated them but now I'm temper is getting out of control so...

I almost have a perfect life, I'm average in school, I'm not ugly but I'm not smoking, I have a loving family but my sister s...