Premenstrual symptoms, often collectively referred to as premenstrual syndrome (PMS), and dysmenorrhea, are common gynecological problems affecting the lifestyle and performance of young women. Different types of studies from both developed and developing countries have found a consistently high prevalence of both dysmenorrhea and premenstrual symptoms in women of different ages and nationalities [
1,
2,
3,
4,
5]. The majority of cases of dysmenorrhea are primary, which is defined as painful menses in women with normal pelvic anatomy that usually begins during adolescence [
6]. Premenstrual syndrome (PMS)/premenstrual dysphoric disorder (PMDD) is defined as a group of disorders characterized by emotional, behavioral and physical symptoms that occur in the luteal phase of the menstrual cycle and subside following menstruation [
7], but remain without definitive physical or laboratory criteria for diagnosis and are associated with some degree of inter-cycle variability [
8]. Physical symptoms of this disorder include headaches, breast tenderness, abdominal bloating, peripheral edema and general fatigue, while psychological or behavioral disorders include irritability, mood swings, food cravings, social withdrawal, anxiety, and depression. While definitive diagnosis of these disorders remains debatable, a prospective record of cycle related symptoms is the gold standard for diagnosis by establishing a relationship between the symptoms and the late luteal phase of the menstrual cycle. Retrospective, self-reporting of symptoms is found to be reasonably sensitive [
9,
10].
The prevalence of PMS is variable [
11]. Prevalence as high as 75–85% is mentioned if one or several symptoms is considered, 10–15% if medical care is requested and 2–5% with social activities interruption [
12,
13,
14]. The causes of premenstrual symptoms are uncertain [
15]. Many theories have been tested regarding possible causes of premenstrual symptoms. While many of the hormonal and biochemical profiles of women with premenstrual symptoms and those who are symptom free were similar, fluctuation in gonadal hormone levels may trigger the symptoms [
16]. PMDD is thought to be related to serotonergic synapse abnormality and women with PMDD are found to have lower serotogenic function in the luteal phase [
17,
18]. A correlation between premenstrual symptoms and dysmenorrhea was made by Isaa and Tomko [
19,
20]. The severity of dysmenorrheal pain and premenstrual symptoms varies among women but it can be severe enough to cause a substantial negative impact on their daily activity. Current understanding of the pathogenesis in primary dysmenorrhea implicates excessive imbalanced amounts of prostanoids and possibly eicosanoids released from the endometrium [
21,
22]. The majority of subjects benefit from administration of nonsteroidal anti-inflammatory drugs (NSAIDs) [
13,
23]. A strong negative correlation between dairy product intake and dysmenorrhea and its associated symptoms among university female students was demonstrated whereby the severity of primary dysmenorrhea decreased with increasing daily intake of dairy products [
24]. These results suggested that dietary calcium, among other substances, may have a functional role in the etiology of dysmenorrhea and a possible relation between calcium and vitamin D and premenstrual symptoms has also been suggested by Bertone-Johson and colleagues [
25]. The aim of this study was to explore the prevalence of premenstrual symptoms in young college students known to suffer from with dysmenorrhea and to investigate any relation with vitamin D and parathyroid hormone levels or consumption of dairy products by these women.