What causes green stool in adults and how should it be managed?
Jun 05, 2023
Source: Cainiu Health
Dr. Shen Yonghua
Introduction
Consuming large amounts of foods rich in chlorophyll, such as spinach, Chinese cabbage, and lettuce, may cause stool to appear green after digestion. Eating foods or drinks containing green pigments can also lead to changes in stool color. If green stool is due to dietary factors, no special treatment is needed; the stool color usually returns to normal gradually after reducing intake of the related foods.
Green stool in adults may be related to dietary factors, medications, indigestion, intestinal dysbiosis, bacterial enteritis, and other causes. Treatment may involve adjusting diet, modifying medications, or using appropriate drugs. It is recommended to visit a hospital to determine the underlying cause and follow medical advice for treatment.
1. Dietary factors: Consuming large amounts of foods rich in chlorophyll—such as spinach, Chinese cabbage, and lettuce—may result in green stool after digestion. Additionally, eating foods or drinking beverages containing green food coloring can also alter stool color. If green stool is due to dietary causes, no special treatment is needed; stool color typically returns to normal gradually after reducing intake of these foods.
2. Medication factors: Taking certain medications—such as iron supplements, bismuth-containing agents, copper-containing drugs, antibiotics, or medications and supplements with green dyes—may change stool color to green. If medications are causing green stool, consult a doctor to determine whether dosage adjustments or discontinuation are necessary.
3. Indigestion: Indigestion can prolong the transit time of food in the intestines, increasing bacterial breakdown of biliverdin in bile. These bacterial byproducts may cause stool to appear green. Adjusting the diet by choosing easily digestible foods such as rice porridge and soft noodles can reduce gastrointestinal burden. When necessary, follow a doctor's instructions to take medications such as domperidone tablets, Dashaanzha pills, or Baohe granules to aid recovery.
4. Intestinal dysbiosis: Imbalance of gut microbiota—caused by illness, antibiotic use, or other reasons—can lead to reduced beneficial bacteria and overgrowth of harmful bacteria, disrupting normal bile metabolism and potentially turning stool green. Consuming probiotic-rich foods such as yogurt or taking probiotic supplements may help. Under medical guidance, patients may use medications such as bifidobacterium quadruple viable tablets, lactase tablets, or live bacillus licheniformis capsules to restore gut health.
5. Bacterial enteritis: Bacterial enteritis, usually caused by bacterial infection, may irritate the intestines and accelerate intestinal motility. As a result, bile does not have sufficient time to be fully absorbed, leading to green-colored stools. This condition is often accompanied by diarrhea, abdominal pain, and other discomforts. Patients should follow medical advice to use medications such as montmorillonite powder, compound coptisine tablets, or racecadotril granules to alleviate symptoms.
In daily life, it is recommended that patients drink adequate water to support metabolism and improve discomfort.
