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Why is my urine yellow and foamy?

Aug 15, 2025 Source: Cainiu Health
Dr. Yang Guang
Introduction
The bladder mucosa becomes inflamed due to bacterial invasion, leading to increased bacteria and inflammatory substances in the urine, causing yellow, foamy urine. This condition is often accompanied by symptoms such as lower abdominal pain, frequent urination, urgency, and foul-smelling urine. Generally, doctors may prescribe medications such as cefuroxime axetil tablets, norfloxacin capsules, and Sanjin tablets for treatment. During the treatment period, it is necessary to increase water intake to help flush the bladder.

　　Yellow urine with foam may be caused by dietary factors, concentrated morning urine, prostatitis, cystitis, diabetic nephropathy, chronic renal failure, and other conditions. If abnormalities occur, timely medical consultation is recommended. Detailed analysis is as follows:

　　1. Dietary influence: Consuming large amounts of high-protein or spicy and irritating foods within a short period can increase urinary metabolites, resulting in yellow urine with foam. It is recommended to adjust the diet, reduce intake of such foods, and maintain a light and balanced diet.

　　2. Concentrated morning urine: During sleep at night, limited water intake leads to prolonged retention of urine in the bladder, causing urine concentration, darker color, and higher solute concentration, which may produce foam during urination. Drinking some warm water after waking up can dilute the urine and alleviate the symptoms gradually.

　　3. Prostatitis: Bacterial infection causes inflammation of the prostate gland, and inflammatory secretions mix into the urine, leading to yellow urine with foam. It is often accompanied by symptoms such as frequent urination, urgency, painful urination, and discomfort in the perineal area. Patients can take medications such as tamsulosin hydrochloride sustained-release capsules, levofloxacin tablets, and Qianlieshutong capsules as directed by a physician.

　　4. Cystitis: Bacterial invasion causes inflammation of the bladder mucosa, increasing bacteria and inflammatory substances in the urine, which results in yellow urine with foam. Symptoms often include lower abdominal pain, frequent urination, urgency, and foul-smelling urine. Doctors generally prescribe medications such as cefuroxime axetil tablets, norfloxacin capsules, and Sanjin tablets. During treatment, patients should increase their water intake to flush the bladder.

　　5. Diabetic nephropathy: Long-term poor glycemic control damages the kidney's microvasculature, leading to abnormal glomerular filtration function. Proteins leak into the urine, forming foam, and the urine may appear yellow due to concentration. This condition is often accompanied by symptoms such as polydipsia and polyphagia. It is recommended to use medications such as insulin injection, metformin hydrochloride tablets, and enalapril tablets under medical guidance to strictly control blood sugar levels and protect kidney function.

　　In daily life, it is important to develop regular hydration habits, avoid holding urine, maintain personal hygiene, and undergo routine urinalysis and kidney function tests regularly. If yellow urine with foam persists or is accompanied by other discomforts, timely medical consultation is advised.

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