<s>[INST] My daughter has a weakening pain in her left forearm......she is left handed, works daily on the computer and also paints intricate pictures in her spare time.  At times she has twitching muscles in her arms and legs on occasion. She is very worried, has had a recent cold that she cannot shake off and has a cough. She is off her food and is very low because of this. [/INST] It may be due to some stress and anxiety common in children for various reasons.Anyway consult a physician for loss in appetite and muscular twitching.serum calcium,sodium, potassium, Vitamin D andB12 levels need testing.high protein diet and fruit juices </s>