What causes treatment-resistant depression?
Scientists and doctors don’t fully know the causes behind treatment-resistant depression. But there are some factors they think may lead to a higher chance of any depression happening—such as environmental factors, other health conditions or family history.
For example, changes in your body due to chronic stress could lead to a higher chance of depression and may make depression harder to treat. Depression in women may be affected by changes experienced during the menstrual cycle, pregnancy or menopause, so there could be a hormonal link. Depression could also run in families, though a specific gene hasn’t been found to confirm that.