Several underlying medical conditions can cause bubbles in the urine. Many of these conditions involve high levels of protein in the urine resulting from kidney malfunction. Health conditions such as infection or dehydration can also cause bubbles in the urine, notes Healthgrades.
Kidney damage associated with high urinary protein levels and a resulting bubbly appearance to the urine may be caused by drugs or toxins such as heavy metals. Infection in the kidneys or inflammation in the filtering structures of the kidneys can also cause bubbles in the urine. Additionally, high blood pressure, diabetes and polycystic kidney disease can cause damage to the kidneys and result in bubbly urine, explains WebMD.
A physician may recommend testing to determine the root cause of any kidney dysfunction causing the high levels of protein and bubbles in the urine, states Mayo Clinic. Some of the other causes of bubbles in the urine may be due to a urinary tract infection, preeclampsia or systemic lupus erythematosus, according to Healthgrades.
It is normal to occasionally pass urine with bubbles in it. The speed at which urine is passed and other factors can determine its appearance. However, consistently passing urine with bubbles in it can be a sign of a serious medical problem, states Mayo Clinic.