Changes in Stool Color: When to Seek Medical Advice - Gastroenterology and Hepatology

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Fecal color inquiry?


Hello Dr.
Chen, I have been taking medication for a cold for the past five days after visiting an ENT specialist.
I understand that taking antibiotics can cause loose stools, but I've noticed that the color has become somewhat darker, though not completely black.
One day, after eating spinach and pig liver, it did turn quite dark.
Today, the color is mostly light brown, but the end is slightly greenish.
I'm not sure if this is due to the vegetables or the medication.
Should I go to a major hospital for an examination, or am I just worrying too much? The cold medications I'm taking include: Cexime, Huaswei (aluminum silicate), Dimemorfan phosphate 10M, Tonpicon, Nimed (nimesulide 100MG), and Moxiclav (1GM).
I only know that one of them is a 1000 mg antibiotic and a round green stomach medication.
Thank you for your response, doctor.

N, 20~29 year old female. Ask Date: 2020/05/22

Dr. Chen Shidian reply Gastroenterology and Hepatology


It should be fine; continue to monitor after taking the medication.

Reply Date: 2020/05/22

More Info


Understanding changes in stool color can be a source of concern for many individuals, especially when they are experiencing other health issues, such as a recent illness or medication use. In your case, you mentioned that you have been taking several medications, including antibiotics, for a cold, and you have noticed changes in your stool color. Let’s break down the potential causes and when it might be necessary to seek medical advice.

Firstly, it is important to understand that stool color can be influenced by a variety of factors, including diet, medications, and underlying health conditions. The medications you are taking, particularly antibiotics, can indeed affect the consistency and color of your stool. Antibiotics can disrupt the normal gut flora, leading to softer stools or diarrhea, and they can also cause changes in color due to the way they interact with the digestive system.

In your case, you mentioned that your stool has been a light brown color with a greenish tint at the end. This could be attributed to several factors:
1. Dietary Influence: You noted that you had eaten spinach and pig liver, both of which can darken stool color. Spinach, in particular, contains chlorophyll, which can give stool a greenish hue. If you have been consuming a lot of green vegetables, this could explain the color change.

2. Medication Effects: Some medications can also lead to changes in stool color. For instance, certain antibiotics can cause darkening of the stool, while others may lead to a greenish tint due to the alteration of bile production or gut bacteria.

3. Bile Production: Green stool can sometimes indicate that food is moving through the intestines too quickly, preventing bile from fully breaking down. This can happen due to diarrhea or other gastrointestinal disturbances.

Now, regarding your concern about whether you should seek medical attention, here are some guidelines:
- When to Seek Medical Advice: You should consider visiting a healthcare provider if you experience any of the following symptoms:
- Persistent changes in stool color that do not resolve after a few days.

- Blood in the stool or black, tarry stools, which could indicate bleeding in the gastrointestinal tract.

- Severe abdominal pain or cramping.

- Diarrhea lasting more than two days, especially if accompanied by fever or dehydration.

- Any other concerning symptoms, such as significant weight loss or changes in appetite.

- Monitoring Your Symptoms: Since you have only noticed these changes for a short period and they may be related to your recent dietary choices and medications, it may be reasonable to monitor your symptoms for a few more days. If the changes persist or worsen, or if you develop any additional symptoms, it would be wise to consult a healthcare professional.

In conclusion, while changes in stool color can be alarming, they are often benign and related to diet or medication. However, it is crucial to remain vigilant and seek medical advice if you notice any alarming symptoms or if the changes do not resolve. Always prioritize your health and well-being, and do not hesitate to reach out to a healthcare provider for reassurance or further evaluation.

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No testing is needed at this time; observation is sufficient.

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