shoulder joint, the ball and socket articulation of the humerus with the scapula. The joint includes eight bursae and five ligaments, including the glenoidal labrum that deepens the articular cavity and protects the edges of articulating bones. It is the most mobile joint in the body. Also called humeral articulation.
It is common for young women to have irregular periods when they first begin to menstruate. This means that ovulation (when a womanâs body makes eggs) may not happen for a few months or even for a few years. So you may not have menstrual cramps when you first begin your period. After one, two, or three years, when your hormonal system is more mature, you might have more severe menstrual cramps.
There may not be an identifiable cause of your painful menstrual periods. Certain women are at a higher risk for having painful menstrual periods. Risk factors include: 1  being under age 20. 2  having a family history of painful periods. 3  smoking. 4  having heavy bleeding with periods. 5  having irregular periods.