Everyone gets the occasional ache or pain — a little soreness in the shoulder, a twinge in the knee — but research shows that women are more frequently and often more severely affected than men. The CDC estimates that from arthritis or chronic joint symptoms affect more than 70 million Americans, 41 million of whom are women. A number of factors contribute to this disparity: Women are more apt than men to have conditions that cause joint pain, experience hormone fluctuations that affect their vulnerability, and may not be physiologically equipped to deal with pain.