I got hit in my upper right side of my back. The hit wasn't two hard so i didn't think it would effect anything. But ever since i got hit i have been having extreme pain on my right side towards the middle of my back..closer to my spine. It hurts when i am sitting up in a chair and even more when i am lying down to go to sleep. The pain is not only triggered when using my right arm but also my left. Doing anything with either arms gives me pain. There is no bruising or swelling so i don't really know what it could be
If this has been going on for over a week you should probably see a doctor. It could be something as simple as a muscle strain or a muscle in spasm. Muscle strains may sound innocuous but they can be very painful. If it's a muscle strain then ice and/or heat and over the counter anti-inflammatories may help. Only a doctor can diagnose you, however. If the pain is not getting better over time be sure to see a doctor.