Thank you for the additional information,
I wonder if lung cancer is a concern of yours...first I would reassure you that this does not sound like it and you are young for it to develop.
Cough with brown or bloody mucus would be one presentation.
Shortness of breath is another presentation.
Your symptoms sound like it may be one of several things.
First is pleuritic chest pain. This is due to inflammation of the two layers that line the lungs. It can be due to viral
illnesses (which may be what is going on given your symptom of sore throat). Treatment for this is with anti-inflammatories such as ibuprofen.
Second possibility is muscle strain
Third, if the pain is in the front of the chest near the breast bone, is costochondritis. This is inflammation of the cartilage/rib joint. Often also viral. Treatment is anti-inflammatories as well.
Fourth is referred pain from the abdomen (gallbladder, for example)
Fifth is early pneumonia
or other infectious process.
Without being able to examine you, it is hard to tell you exactly the cause.
I would try ibuprofen for the pain and I would see your doctor for an exam and possibly a chest xray as well.
Feel free to ask any follow up questions and I will be happy to discuss further with you,
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