While it is currently believed that postpartum depression isn't purely a genetic or chemical disease, and that external factors play a part, researchers have been looking more closely at the biological side of things. A new study reported in the American Journal of Psychiatry has found that genetic variations on chromosomes 1q21.3-q32.1 and 9p24.3-p22.3 may increase susceptibility to postpartum mood symptoms.
Damn you, 9p24.3-p22.3. How many timeshave I told you toBEHAVE?!!??!
For more stories on the possible causes of postpartum depression, click the link.