Protein is a large, complex molecule that must undergo a series of processes during digestion. During digestion and absorption, protein passes through many organs. Once protein is digested, the body can utilize its nutrients to build and repair many of the cells in the body.
Menstrual cramps may be caused by:[5] 1  Endometriosis: The tissue that lines your uterus becomes implanted outside your uterus, most commonly on your fallopian tubes, ovaries or the tissue lining your pelvis. 2  Uterine fibroids: These noncancerous growths in the wall of the uterus may be the cause of pain.
Sometimes, it's not possible to identify the exact cause of breast pain. Contributing factors may include one or more of the following: Reproductive hormones. Cyclic breast pain appears to have a strong link to hormones and your menstrual cycle.