Hello, * There is a definite reason for pain as biliary colic or other issues. * A negative ultrasound scan does not rule out each and every possible cause of the RHC pain. * In my clinic, I recommend to undergo HIDA scan and MRI of the abdomen to go for more precise evaluation and best possible cure of the condition. * Till that time, antispasmodic as drotaverine will serve best pain relief in the case. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Bhagyesh V. Patel, General Surgeon