There are 6 types of edema. Generalized edema, skin edema, peripheral edema, corneal edema, cerebral edema, pulmonary edema, myxedema and lymphedema.

Discogenic edema is swelling (edema) of the vertebra in the spine (disc's).

Yes, low oncotic blood pressure is a major cause of dependent pitting edema. Proteins in the blood exert an oncotic pull on blood serum which keeps the serum within the blood vessels. A loss of these proteins decreases the ability of the blood to keep serum within the blood vessels and the serum will leak out into the interstitial space. Gravity then pulls the edema fluid downward into the legs.

edema

Edema