What is the percentage of women who suffer from dysmenorrhea?

Dysmenorrhea is defined as difficult menstrual flow or
painful menstruation. The term dysmenorrhea is derived from the Greek
words dys, meaning
difficult/painful/abnormal, meno, meaning month,
and rrhea, meaning flow.

Dysmenorrhea
is one of the most common gynecologic complaints in young women who present to
clinicians.
The optimal management of this symptom depends on an understanding of the
underlying cause. Dysmenorrhea is classified as primary (spasmodic) or secondary
(congestive).

Primary dysmenorrhea is defined as menstrual
pain not associated with macroscopic pelvic pathology (ie, absence of pelvic disease).
It typically occurs in the first few years after menarche and affects up to 50% of
postpubescent females.

Secondary dysmenorrhea is defined as
menstrual pain resulting from anatomic and/or macroscopic pelvic pathology, such as that
seen in women with endometriosis or chronic pelvic inflammatory disease. This condition
is most often observed in women aged 30-45 years.