Other researchers say too much protein can cause cramps, headaches, and fatigue.
2019年12月六级真题（第二套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
N-UNCOUNT
痛性痉挛;抽筋
Cramp is a sudden strong pain caused by a muscle suddenly contracting. You sometimes get cramp in a muscle after you have been making a physical effort over a long period of time.