1. Abnormal urine color:  Blood-colored urine could be a sign of kidney disease, kidney stones, prostatitis, or bladder tumors. Milky-white urine accompanied by urinary abnormalities, fever, and back pain could indicate a severe urinary system infection. 

2. Foamy urine: While some foamy urine is normal, persistent foam and cloudy urine may indicate pathological proteinuria, often caused by kidney diseases.

3. Abnormal urination frequency: If you are urinating more frequently or producing excessive urine volume without excessive water intake, it could be due to conditions like chronic nephritis or diabetes. 

4. Painful urination: Urinary system inflammation and kidney stones commonly cause painful urination.

Kidney stone patients may experience sharp, burning, or stabbing pain during urination.