<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have a pain in left lung for a couple of months , also a persistent cough and only recently coughing up a brownish substance which has me concerned. I dont feel unwell but get tired quite easily. I I am a 47 yr old female. My GP said he couldnt hear anything going on , and it might be muscular ?Kind regardsL. Mc  <response>: Hello, You have brown sputum expectoration in form of cough since many months. So, it should not be neglected. Your work up is needed in form of chest x-ray. If chest x-ray normal, then no need to worry and bronchitis can be the possibility for which antibiotic course prescribed and symptomatic management done. Provide your reports for giving more comment. Hope I have answered your query. Let me know if I can assist you further. 