Background. Menstrual pain syndrome is accompanied by a complex of neurovegetative, metabolic-endocrine and psycho-emotional disorders. Dysplasia of connective tissue is characterized by a high level of functional disorders of the central and autonomic nervous system and emotional disorders.
 Aim. Detection of features of a clinical current of primary dysmenorrhea in adolescent girls with signs an undifferentiated dysplasia of connecting tissue (UDCT). Materials and methods. 210 adolescent girls at the age of 11–17 full years suffering primary dysmenorrhea were examined. Depending on the presence or absence of clinical signs of undifferentiated connective tissue, two groups were identified. The main group consisted of 120 patients, the comparison group comprised 90 patients. The severity of the menstrual pain syndrome was assessed using the three scales of the McGill Pain Questionnaire. For psychological testing was used a scale of self-assessment of anxiety of Ch.D. Spielberger – Yu.L. Khanina.
 Results. In 90.9 ± 2.6% of patients of the main group the debut of a dysmenorrhea has taken place in the period of formation of menstrual function — within the first 2 years after menarche. The average value of the rank index of pain in the main group was higher than in the comparison group (3.5 ± 0.1 and 2.8 ± 0.1, p < 0.001). In an internal picture of perception of pain at patients of the main group the emotional component prevailed. Their psychoemotional status was distinguished by a higher level of the average score of reactive (45.3 ± 0.9 and 36.3 ± 1.4; p < 0.001) and personal (49.9 ± 0.6 and 41.4 ± 1.0; p < 0.001) of anxiety.
 Conclusions. The obtained results give the grounds to consider the presence of clinical manifestations of an undifferentiated dysplasia of a connecting tissue in adolescent girls as a predictor, which is making heavier a clinical current of a menstrual pain syndrome.