Although one might expect a higher rate of postpartum depression among those with PMDD, a large study of women with prospectively-confirmed PMDD did not find a higher prevalence of postpartum depression than in controls. If a woman had experienced PPD beforehand, there was found to be a less-than 12% chance of PMDD pathology emerging—hardly any differentiation from the regular population of those who have never experienced postpartum depression. However, PMDD symptoms can get worse following pregnancy, or other associated events such as birth and miscarriage. Mental Health Comorbidities in PMDD
The lifetime incidence of other psychiatric disorders is high among women with PMDD. An older review article (2002) utilizing the previous edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) used studies from 1966 to 2002 on PMS and mental health disorders and selected for patients who retrospectively met the diagnostic criteria for PMDD and found that Major Depressive Disorder, Seasonal affective disorder, and generalized anxiety disorder often co-occur in PMDD. Another systematic review study suggests that patients with bipolar disorder, type I or II, have a higher incidence of PMDD. While the diagnosis of PMDD requires a mental health provider to determine that the symptoms a woman is facing is not due to an underlying mental or physical health condition, it is important to note that other conditions often co-occur and impact the quality of life and treatment plan for people with PMDD.
Consideration of Other Psychiatric Disorders
Criterion E: The disturbance is not merely an exacerbation of the symptoms of another disorder, such as major depressive disorder, panic disorder, persistent depressive disorder (Dysthymia), or a personality disorder—although it may co-occur with any of these disorders.Confirmation of the Disorder
Criterion F: Criterion A should be confirmed by prospective daily ratings during at least two symptomatic cycles. The diagnosis may be made provisionally prior to this confirmation. Criterion G: The symptoms are not attributable to the physiological effects of a substance (e.g., drug abuse, a medication, other treatments) or another medical condition (e.g., hyperthyroidism). Clinically significant distress is not defined explicitly by the DSM-IV, where it has been critiqued by multiple scholars as being too vague, and potentially detrimental for those who have symptoms of depression, anxiety, or other mood disorders because they do not meet the clinical significance requirement. ICD 11
Diagnostic criteria for PMDD are also provided by the 2016 World Health Organizations International Classification of Diseases (ICD-11-CM):

GA34.41 Premenstrual dysphoric disorder
Description
During a majority of menstrual cycles within the past year, a pattern of mood symptoms (depressed mood, irritability), somatic symptoms (lethargy, joint pain, overeating), or cognitive symptoms (concentration difficulties, forgetfulness) that begin several days before the onset of menses, start to improve within a few days after the onset of menses, and then become minimal or absent within approximately 1 week following the onset of menses. The temporal relationship of the symptoms and luteal and menstrual phases of the cycle may be confirmed by a prospective symptom diary.