According to the Mayo Clinic, passing foamy urine from time to time is a normal, natural occurrence. However, individuals who experience foamy urine that grows more noticeable over time must see a doctor for an examination. Foamy urine may indicate excess amounts of protein in the urine, which can be a sign of a potentially serious kidney problem.
Foamy urine is to be expected during certain points in a person's life. For example, pregnant women may experience foamy urination due to kidney enlargement during their baby's gestation period, and menstruating women may pass foamy urine during the first two days of their menstrual period, according to MD Health.
The New Health Guide reports that foamy urine is sometimes a symptom of urinary tract infections in women. During these instances, women usually also experience a frequent urge to urinate, abdominal pains, fever, traces of blood in urine, pain during urination, foul-smelling urine, and a greenish or yellowish discharge. Men who pass foamy urine are more prone to have a condition called vesicocolic fistula, which is an abnormal connection between their bladder and colon. Women may also experience this condition and must see a doctor for a full examination if the condition persists or worsens.