Drink plenty of fluids. Water, juice, clear broth or warm lemon water with honey helps loosen stuffiness, called congestion. These also help prevent losing too much fluid, called dehydration. Don't drink alcohol, coffee and sodas with caffeine.
Hyponatremia is caused by drinking too much fluid, which dilutes blood salt levels below the normal range.In general, though, drinking too much water is rare in healthy adults who eat an average American diet. Whats a good way to determine your hydration levels?

When you drink more water than you need, the first thing that happens is overhydration. Murphy Richter says youll know when youve had too much if you need to pee every hour or more, or if your pee is completely clear.

Why Drinking Too Much Water Can Affect the Heart. Your heart works closely with your kidneys to maintain fluid balance in the body. When you drink large amounts of water quickly, your blood volume increases temporarily.

Drink more fluids.Drinking too much at one time when your stomach is upset may cause more vomiting. Fluids that help keep you hydrated and may ease nausea can include
Too much fluid consumption can become serious when it causes a dilution of sodium in blood. This creates a swelling of the brain and lungs, as fluid shifts to try to balance out blood sodium levels.
drinking too much alcohol causes a hangover.