What're the renal insufficiency symptoms?

Renal failure: Renal insufficiency is often asymptomatic initially. However as renal function deteriorates, you get a build up of toxin in the blood which cause nausea, vomiting, fatigue, shortness of breath, tremor/twitching, daytime somnolence, food can begin to taste bad....This is usually after the kidney function is less than 30% (often less than 15%).