<unk>  (or "Fluid overload") is the medical condition where there is too much fluid in the blood.  The fluid can either be intravascular or extravascular and result in edema.
The opposite condition is Hypovolemia (too little fluid volume in the blood).
Hypervolemia
Dehydration
Hypovolemia
Third spacing of fluids
Renal tubular acidosis
Water intoxication
Hyperosmolar hyperglycemic state
Adrenal fatigue