Vascular Impairments
The venous system is responsible for rerouting around 90 percent [6] of the fluids in the body. This function can be impaired by diseases that affect the veins. Damaged veins can cause fluid to overflow into the tissue spaces around. When this happens, the lymphatic system steps up and assists in filtering these fluids. If normal venous function isn’t restored, the work might become too much for the lymphatic system. This can cause it to become impaired and swell, leading to lymphedema.
Diseases such as chronic venous insufficiency put a lot of strain on the lymphatic system and can cause lymphatic insufficiency. This condition is referred to as phlebolymphedema [7]. Chronic venous insufficiency and phlebolymphedema may be caused by underlying conditions, such as heart failure, pulmonary hypertension, renal failure, and paralysis.
Obesity
Obesity [8] is the medical term that describes having much more than average body fat. It is considered a probable cause of lymphedema. This is probably because obese people are more likely to have swollen body parts.
It is not clear why this happens, but extra fat may disrupt the lymphatic system by pressing down on the lymph nodes and lymph vessels. This can impair drainage from the lymph vessels and cause lymphedema.