Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Gitelman syndrome ?
    ### Response:
    Gitelman syndrome is a kidney disorder that causes an imbalance of charged atoms (ions) in the body, including ions of potassium, magnesium, and calcium.  The signs and symptoms of Gitelman syndrome usually appear in late childhood or adolescence. Common features of this condition include painful muscle spasms (tetany), muscle weakness or cramping, dizziness, and salt craving.
    