My son was just told that he has MGUS. We are so confused by what the doctor said and what we have read. He has been through lots of test, experiences pain that the oncologists says has nothing to do with MGUS( leg pain , numbness in his leg and both feet, gets very weak, unable to even work at times). He is only 44 yrs old. He has had stones many times and gets pain in both kidneys when he attempts to exercise.