Why does my chest hurt?

Just wait it out, it will go away. Getting hit in the chest can cause quite a disturbance. The chest wall is very vascular and has ALOT of nerves. Any exercise is going to aggravate so go easy for a couple of days. Hold a pillow to your chest and squeeze it when you sneeze or cough to splint the pain, helps a little. Take it easy and if it gets worse, go see the doc to make sure nothing got too messed up. Soccer is so rough, my daughter plays and it scares the crud out of me, I can only imagine how much harder those come flying at you when a guy kicks it.....makes my chest hurt thinking about it. Hey, just FYI....hydrate well the day before practice or a game.