<s>[INST] I have had a head cold and productive cough for about 3 weeks. I have not felt bad (with the exception of being stopped up) or ran fever the whole time. Now my back hurts on the left side and it feels like I may have pulled something. Could this have any correlation? [/INST] Hi, thanks for posting your concern in the Chat Doctor. My recommendation is to visit your local doctor to rule out pneumonia, any infection or inflammation involving the spine etc. In case of a bad pneumonia you may have back pain, so occurs in spinal pathology. In cough and fever for more than 2 weeks, tuberculosis must also be ruled out. Any other lung pathology should also be ruled out. A complete blood count, CRP, sputum for microscopic examination and culture, chest X-ray pa view may be done. Your doctor will decide whether any further investigation will be needed depending upon the clinical findings. For any further questions please write back to us. Regards.  </s>