There are various clinical reasons for low progesterone, and the common reasons are as follows: 1. Age factor. With age, the function of female endocrine system will have a certain decline. Luteinizing hormone content and endocrine function is very close, the body’s luteinizing hormone content in addition to a certain relationship with nutrients, but also with the endocrine function is closely related, if the female endocrine system is low or dysfunctional, it will lead to promote the synthesis of luteinizing hormone amount of hormone decreased, resulting in the amount of luteinizing hormone in the body of women fell; 2, female malnutrition. Because progesterone to synthesize, need certain substances as the basis, such as protein, sugar and amino acids, and cytokines, etc., if these nutrients lack, even if all other aspects are normal, the content of progesterone will decline.