Fluid accumulation in the tissues of the body often leads to swelling which is termed fluid or water retention or edema. Heart or kidney diseases infections brain tumor drinking less water or dehydration and pregnancy are some of the causes. Edema is not a serious condition and can be easily managed by making a few dietary modifications. Here are a few ways to treat the condition: Check your salt consumption: First step reduce salt intake. Sodium binds to water molecules to maintain the balance of fluids in the cells and over consumption of salt can lead to water retention .