I have non obstructive renal calculi between 3 to 4mm. I have no pain. Is it anything to worry about? Any treatment to get it removed?

See remark. A stone that size may stay there BUT can increase in size with time.It can drop down the ureter,and that cause agonizing pain.Drink gererous amount of water.Drink one glass of lemonade in am & one in pm.Lemonade won't dissolve stones but help prevent them.If your job entails travelling/flying consult with a urologist best regards.