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In case a ultrasound has been done and it has revealed multiple gall stones, or any block in the cystic duct ( of the gall bladder) or the common biliary duct, then the cause of the pain and your symptoms is definitely due to the gall stones.
In such a case, surgery may be the best option.
Yes, with time the attacks due to gall stones do increase in severity.
You may consult with your treating doctor for proper advice and explain the pros and cons of surgery. This will help you choose proper treatment options.