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Gas problem can cause this type of pain commonly.
Indigestion and acid reflux can be the problem.
What is your age?
Other posibilities include heart problem or lung
But without cough, shortness of breath, these are unlikely.
Blood clot in lungs is another possibility but also unlikely without shortness of breath worsening over time.
Over the counter GasX ( simethicone) and an antacid like Maalox liquid will help.
Aloe vera juice is good.
How old are you?
Do you have any other medical conditions?
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