<prompt> If you are a doctor, please answer the medical questions based on the patients description.my age is 70 hgt 5 6 weight 63 kgs undergone complete thyroid removal operation due to cancer.taking eltroxin 100 mg 2 tab early morning before food. frequent body cram and catch. calcium 500 mg 2 a day at present I am taking. calcium level is 7 only. please advise  <response>: Hello, Your calcium level is 7. In best of my knowledge calcium should be between 9-11 mg percent. So your calcium levels are very low. Low calcium, magnesium low blood sugar may lead to cramps in arms and legs. You should do following to correct your level of calcium:-Take citrate preparation of calcium. This type of calcium preparation is absorbed well it has good bio availability.- You may have diet rich in calcium like milk and milk products, egg,cheese, etc.- Take vitamin D supplements. Without vitamin D calcium is not absorbed in body. Take all these for at least 4-6 months. Concomitant use of vitamin E preparation with L carnitine decrease the chances of occurrence of cramps. Hope I have answered your question. Let me know if I can assist you further. 