Postpartum depression (PPD), also called postnatal depression, is a type of clinical depression which can affect women, and less frequently men, typically after childbirth. Studies report prevalence rates among women from 5% to 25%, but methodological differences among the studies make the actual prevalence rate unclear. Among men, in particular new fathers, the incidence of postpartum depression has been estimated to be between 1% and 25.5%. Symptoms include sadness, fatigue, changes in sleeping and eating patterns, reduced libido, crying episodes, anxiety, and irritability. Although a number of risk factors have been identified, the causes of PPD are not well understood. Many people recover with a treatment consisting of a support group or counseling.