Women with dysmenorrhea, usually pain in the lower abdomen, may be pain in the middle of the lower abdomen or pain on the left side of the lower abdomen, or on the right side, because the causes of dysmenorrhea are different, so the parts of the dysmenorrhea are only somewhat different, as follows: 1. Middle of the lower abdomen: for women with primary dysmenorrhea, it is usually pain in the middle of the lower abdomen; 2. Left side or right side of the lower abdomen: but If a woman has secondary dysmenorrhea due to ovarian chocolate cysts, then this may be on the left side of the lower abdomen, or on the right side of the lower abdomen. In a small number of women, there may be pain on both the left and right side of the lower abdomen, such as women with chocolate cysts on both the left and right ovaries.