Hi, As mentioned by you, There seems to be two things as per my understanding. First - if we know the exact location then we can figure out if the muscle spasm is due to the kidney issue Second - may be it is related to the pathology of the spine. Also to understand here, Muscle spasm can be due to end number of results, as you have taken a self medication it might be the case of frequent urination. Since you have not mention any history of abdominal pain or kidney stones. As to my knowledge, Taking hot water fermentation will help ease the symptoms of muscle spasm. Mean time kindly avoid self medication. For muscle spasm, you can take a physical therapists advice to understand that exercises are more important. When muscles becomes weak, to avoid any particular injury the muscle goes into spasm. Also, an abnormal jerky movement can lead to the same. Prevention is better than cure. I wish you a good health Regards Jay Indravadan Patel