Hi,
The commonest causes of pain in throat on one side and in chest, lung as you have mentioned can be as follows:
Smoking causing changes in lower part of throat that is pharynx causing mucus secretion and thus the need to clear the throat. This in turn can cause ulcer like changes due to excessive straining caused by excessive clearing of the throat.
Changes in muscle causing edema, or strain on the bones forming the neck in the front part cause pain.
Muscle straining, may be due to faulty posture of neck due to over work with computers or studies.
This can be diagnosed by the following ways:
Clinical examination by a Doctor, preferably an ENT Surgeon.
CT scan of Neck.
Endoscopy of the pharynx and
esophagus is a must,
biopsy if needed.
Stop smoking.
Prescription based medications.
Change of habits, posture of neck and so on.
Avoid all the instigating and enhancing factors.
All these can help you a lot.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, General and ENT Surgeon