Can a UTI cause back or side pain?

Yes, but back or side pain with a UTI can be a warning sign that the infection has reached the kidneys. A simple bladder infection more commonly causes burning urination, frequent urination, urgency, and lower abdominal discomfort. When UTI symptoms occur with pain in the back or side especially along with fever, chills, nausea, or vomiting—prompt medical evaluation is important.

Why can a UTI cause back or side pain?

A lower UTI usually affects the bladder and does not typically cause significant back pain. If bacteria travel upward through the urinary tract and infect one or both kidneys, the infection can cause pain in the back or side, often around the flank area.

This type of infection is commonly referred to as pyelonephritis or a kidney infection.

What symptoms can occur with a kidney infection?

Back or side pain may occur together with:

• Fever
• Chills or shivering
• Nausea or vomiting
• Burning while urinating
• Frequent or urgent urination
• Blood in the urine
• Feeling weak or generally unwell

Not everyone will experience every symptom.

How is UTI-related back pain different from ordinary back pain?

Back pain has many possible causes, including muscle strain and spinal problems. UTI-related flank pain becomes more concerning when it occurs together with urinary symptoms or signs of infection, particularly fever and chills.

A healthcare professional may need to assess the symptoms and perform urine testing to determine whether the pain is related to a urinary infection.

Can kidney stones cause similar pain?

Yes. Kidney stones can cause significant back or side pain, and they can sometimes occur alongside urinary infections.

This distinction is important because an infection occurring in an obstructed urinary system can require urgent treatment. Recurrent UTIs with flank pain may therefore warrant evaluation for underlying urinary tract problems such as stones or obstruction.

When is back or side pain with a UTI an emergency?

Seek prompt medical attention if UTI symptoms are accompanied by:

• High fever or chills
• Severe or worsening flank pain
• Repeated vomiting
• Confusion or marked weakness
• Difficulty passing urine
• Blood in the urine
• Rapid deterioration or feeling seriously unwell

These symptoms can indicate a more serious infection or an obstructed urinary tract.

SCI International Hospital

At SCI International Hospital, Dr. Gautam Banga evaluates patients who have UTI symptoms along with back or side pain to determine whether the infection may involve the kidneys or whether another urological condition could be responsible.

Where appropriate, evaluation may include urine testing, urine culture, blood tests, or urinary tract imaging, particularly when symptoms are severe, recurrent, or associated with suspected stones or obstruction. Identifying an underlying urological problem is important in patients who experience repeated urinary infections.