hi, thank you to providing the brief history of you. As you mentioned you have pain in the finger joints, is the pain present or more in the morning ? if the pain is more in the morning with stiffness of finger joints than a RA test can be performed to check if RA is positive? Also as you have been doing kick boxing workout, do you use more of the pinching activities? as punching activities may lead to soft tissue and hard tissue trauma as well. For which you can take a X-ray / CT / MRI and it will help us understand better. But even to note a point here that you are doing kick boxing so is there any issue with the neck.? What is the nature of the pain you are feeling? stiffness, blunt, burning, tingling, numbness? What sort? Also while performing kick boxing there is a chance to damage the cerical spine soft tissue as the activity of kick boxing demands a high thrust. once you rule out all the possible factors than the matter can be really taken into consideration for a closer look to the diagnosis. I hope you will be finding your answer soon. With the grace of God I wish you a speedy recovery regards Jay Indravadan Patel