There are several types of edema, and many cases are also a mixture of more than one type. By lymphedema the drainage from the tissues through the lymph vessels are impaired or excessive fluid goes through the blood capillary walls into the spaces between the cells in a tissue. Edema can also occur because of poor drainage of blood through the veins towards the heart. Edema can further be caused by general accumulation of excessive fluid in the body.
The causes of edema are many. Edema is a symptom by most inflammations. Insufficient heart action by congestive heart failure can cause edema. A too high intake of salt can cause general water retention in the body. Sitting and standing long in the same position can cause edema in the lower limbs. A still sitting life without exercise can cause or aggravate edema.
Insufficiencies of the liver or kidneys can cause fluid retention and thereby edema. Edema can be a side effect of antihypertensive drugs, steroids surgery and radiation therapy. Further causes of different types of edema are varicose veins, cancer, hypothyroidism, blood clots, constipation and physical injuries.
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