 [ Symptoms ] pain left breast cough 103 fever cannot sleep on side [ Disease ] com seems you are having a chest infection with or without pleuritis your pain is either due to pleuritis or a muscle strain in your left upper chest or back due to coughing i recommend using hot packs on your pain area if it does not help then you need to see a pulmonologist if your cough is productive you need to do a culture of sputum