4. There may be problems with your liver.
Apart from its other functions, the liver produces a protein called albumin. This protein keeps fluid in our bloodstream and doesn’t let it leak into our tissues. Some liver diseases may lower the level of albumin in the blood,
and cause fluid to pass from the bloodstream into the body’s tissues. In this case, swelling may not only occur in the feet and ankles, but in other parts of the body as well.
5. Your lymphatic system may fail to drain bodily fluids.
Together, with blood vessels, our lymphatic vessels deliver oxygen and nutrients to tissues and organs and remove waste and CO2. When lymphatic vessels get blocked and fail to perform their drainage function,
this may result in an abnormal buildup of fluid called lymphedema. Lymphedema can occurdue to infections, surgery, trauma, radiation, cancer treatment, and other factors.