How would I know if I have liver or kidney problems?

You might not. Chronic liver or kidney disease is often asymptomatic until it approaches end stage (near death). You could have swelling of feet, turn yellow, have itching, tiredness, low energy level, short of breath. Risk factors include family history, viral hepatitis infection, diabetes, hypertension, ; liver and kidney function is easily and cheaply tested.
Symptoms,test,US. Symptoms & signs, malaise, generally feeling unwell, flank or abdominal pain, jaundice. Urine: presence of blood protein or bile . Blood lab. Tests: liver function tests, bun, creatinine, pth, crp. Abnormalities on abdominal or kidney ultrasound. Abdominal ct scan.