The tips of my index and thumb fingers of both hands feel swollen and a bit numb, but they visually seem fine. it comes and goes. what could it be?

Continue to monitor: Numbness and tingling in any extremity can be due to many reasons including sitting or standing in the same position for a long time, nerve injury, electrolyte abnormalities, vitamin deficiencies, etc. See your physician for evaluation if your symptoms persist or you develop new associated symptoms. http://www.ninds.nih.gov/disorders/paresthesia/paresthesia.htm