What causes lower lid bags?In the majority of cases, eye bags are caused by herniation of fatty tissue through a thin membrane in the eyelids called the septum. This membrane becomes progressively weak with the passage of time, which is why eyelid bags are more common after a certain age. However, young people in their twenties or thirties may also have bags under their eyes. In these cases, bags are usually caused by insufficient support from the cheek bones. Regardless of the cause, an oculoplastic surgeon can offer you the best surgical or non-invasive alternative to get rid of those bags.