What causes low blood urea nitrogen (BUN)?

Generally, low blood urea nitrogen (BUN) levels may be caused by insufficient protein intake, excessive water consumption, indigestion, diabetes insipidus, hepatitis, and other reasons. If the above conditions occur, it is recommended to seek medical attention promptly. Specific analyses are as follows:

1. Insufficient protein intake

Long-term vegetarian diets, dieting, or unbalanced nutrition can reduce the raw materials needed for protein synthesis and subsequent urea nitrogen production in the body. It is advisable to increase protein intake by consuming more high-protein foods such as meat, fish, and legumes.

2. Excessive water intake

Drinking large amounts of water in a short period can dilute the blood, thereby lowering the concentration of urea nitrogen. In daily life, water intake should be reduced to a normal range to maintain fluid balance.

3. Indigestion

Indigestion is usually related to poor eating habits, eating too quickly, or consuming hard-to-digest foods. This condition may impair the absorption and utilization of dietary proteins, leading to the aforementioned symptoms. It may be accompanied by abdominal pain, nausea, and other symptoms. Treatment under medical guidance may include medications such as domperidone tablets, compound digestive enzyme capsules, or Jianwei Xiaoshi tablets.

4. Diabetes insipidus

Inflammation, certain medications, chronic nephritis, and other factors may lead to diabetes insipidus. Due to a deficiency of antidiuretic hormone or kidney insensitivity to this hormone, patients excrete large volumes of urine, resulting in low urea nitrogen levels. Symptoms may include excessive thirst and increased nighttime urination. Patients should follow medical advice and take medications such as desmopressin tablets, hydrochlorothiazide tablets, or potassium chloride sustained-release tablets.

5. Hepatitis

Hepatitis is primarily caused by viral infections, alcohol abuse, drug toxicity, and similar factors. The liver is the main organ responsible for urea synthesis; when liver function is impaired, urea production decreases, leading to low BUN levels. Symptoms may include jaundice, ascites, and others. Under medical supervision, treatment may involve medications such as entecavir dispersible tablets, ursodeoxycholic acid capsules, or compound glycyrrhizin tablets.

In daily life, maintaining a balanced diet, drinking an appropriate amount of water, chewing food thoroughly to aid digestion, and avoiding unhealthy habits such as excessive alcohol consumption or drug abuse are important for preserving overall health.