D, because your brain is what makes almost all of your organs work.
girl's periods get more regular, cramps are more likely.They can be mildly annoying to extremely painful, and they usually last for a few days. Cramps may worry some girls at first if they don't know they're often a normal part of having a monthly period.<span>
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it might be fibromyalgia, there is a higher chance that she has Rheumatoid Arthritis, which attacks the joints and destroys them and is an auto-immune disorder.
