A simple bladder UTI does not usually cause giddiness or vertigo. Typical symptoms are burning while passing urine, urgency, frequent urination, lower abdominal discomfort, and sometimes cloudy or bloody urine.
Giddiness can occur if the infection is more severe, for example:
- Fever, poor fluid intake, vomiting, or reduced eating can cause dehydration and lightheadedness.
- A kidney infection may cause fever, chills, flank/back pain, nausea, and feeling very unwell.
- Rarely, infection spreads into the bloodstream and causes sepsis, which can cause lightheadedness, confusion, rapid breathing, fast heartbeat, or low blood pressure. A UTI can be the source of sepsis. Mayo Clinic's sepsis symptoms include lightheadedness and mental-status changes.
Seek urgent medical care today if giddiness occurs with fever or chills, back/flank pain, vomiting, confusion, fainting, severe weakness, rapid breathing/heartbeat, inability to pass urine, or very low urine output.
Giddiness may also be unrelated to a UTI, such as from low blood pressure, anemia, low blood sugar, inner-ear conditions, medication effects, or heart/neurologic problems. If you have urinary symptoms plus giddiness, a clinician can check urine testing, temperature, blood pressure, and hydration rather than assuming the UTI is the only cause.