The pain may start as a severe
pain in the
side, back, and
below the
ribs, which may spread to the lower abdomen and groin. The pain comes in waves and fluctuates in intensity, and may be associated with nausea, vomiting, fever, and chills if an infection is present. Other common symptoms include pain during urination, persistent urge to urinate, and frequent urination. You may also notice pink, red, brown, or cloudy and foul-smelling urine.