<s>[INST] 30 year old male poor diet and very overweight.  I was active and eating healthy and then stopped and began a poor diet. Now I am having chest pain/tightness for a week or more it is on the right side.  What could this be?  I know I need to change my diet, and stop drinking.  I am not a smoker. [/INST] pain on right side can be due to muscle ache or nerve pain or any pleural disorder.you need to visit a pulmonologist who can request for a chest xray and diagnose the exact cause .for the timebeing you can take a analgesic like paracetamol after disscussing with a general physicianthanksfeel free to ask more questionsmay God bless tou with good health </s>