Is it normal for an adult’s stool to be green?

Green stool in adults is also considered a normal phenomenon. Typically, adult stool is light to dark brown, and its color can be influenced by diet. For example, consuming large amounts of green leafy vegetables may result in greenish stool, as certain indigestible plant pigments (e.g., chlorophyll) pass through the digestive tract unchanged and are excreted with other fecal matter.

Besides dietary factors, green stool may also occur due to “excess internal heat” (a traditional Chinese medicine concept referring to inflammatory or hypermetabolic conditions). In such cases, consuming heat-clearing herbs or foods—or taking appropriate over-the-counter remedies—may help. Maintaining adequate hydration and avoiding spicy, stimulating foods can also prevent “internal heat,” thereby reducing the likelihood of green stool.

Green stool may also indicate underlying gastrointestinal disorders. If this persists or is accompanied by other symptoms (e.g., abdominal pain, diarrhea, weight loss, or blood in stool), prompt medical evaluation is essential. Treatment depends on the underlying cause; for instance, prokinetic agents such as domperidone may be prescribed for motility-related issues. If gastrointestinal bleeding is suspected—especially if stool appears black, tarry, or maroon—immediate diagnostic testing (e.g., endoscopy) and treatment are critical to prevent complications and ensure optimal outcomes.