I'm not a doctor. Take this with a grain of salt.
When I hear "tingling," the first thing I think about is nerve "issues." This could be like a pinched nerve affecting your left side or it could be a serious issue.
The second thing I think about this is that you say it's on your left side. Again, not being a doctor this is a wild guess, but it could be related to your heart. The left side is usually where you're going to feel heart-attack related pain, which is why I say that.
Now, DO NOT PANIC because I say this. Again, I'm just some schmoe on the internet.
The bottom line is, GO SEE YOUR DOCTOR. Even if it's nothing or something really mild, at least you'll know.
If it is serious, the sooner you get it checked out the better.
So go get checked out!