Yeah, all the time

Yes especially sine I had pneumonia in December

Did you have surgery for pneumonia?

No. Just antibiotics and rest.

Yes! And I don't know why. Sometimes it is also on the right side, but mainly in the left side. I didn't have pneumonia or something like that, and my heart has been checked and everything came back normal, as usual...

Left side is where your pancreas is, does it hurt especially after you eat?

No, it does not seem to be affected by food.

Left side is where the heart is located, is the pain getting worse during excercise? If so you should see a doctor to rule out any heart problems. My husband has those, when he works out he sometimes feels pain in his left chest...

Probably not your pancreas then, definitely get heart checked out, ekg, stress test. I am tender in my rib area and I've been told it's just "chest wall pain". But I have fibromyalgia and very large breasts and no spontaneous pain in that area. Are you left handed?