There is nothing to worry about it is due to chest infection
that can spread to the pleura the outer covering the lungs.
It can be treated easily with the combination of
1. An Antibiotic such as Avelox 400 once daily for 05 days.
2. A decongestant such as Telfast D that is a combination of Pseudoephedrine
twice daily for 05 days.
3. Pain killer such as Ibuprofen
400 mg thrice daily for 05 days
4. Antitussive such as Sancos that can reduce your cough so your precipitating factor for pain to be relieved.
You will be fine in a day or two donot worry take these medications and have chest xray to rule out other things such as pleural effusion
I hope I am successful in solving your query If you have more you can ask me.
Take care and have good rest.
Dr. Azhar Sattar