The smell of ammonia in stool can be a warning sign of underlying health conditions. According to medical editors at The WP Times, this odor may sometimes result from dietary choices or temporary digestive stress, but it often points to metabolic or organ dysfunction that requires attention. Ammonia is a nitrogen by-product of protein breakdown, and an excess in the body can reflect imbalances in detoxification or gut flora. Below, we explain the five main causes and when to see a doctor.

1. Liver dysfunction

The liver is vital for protein metabolism and detoxification. When it fails to process ammonia efficiently, the compound can accumulate in the body and be excreted through stool. This may indicate liver diseases such as hepatitis or cirrhosis.
Typical warning signs include:

  • Yellowing of the skin or eyes (jaundice)
  • Swelling in the legs or abdomen
  • Persistent fatigue or confusion

Liver tests (AST, ALT, and ammonia levels) are essential to identify the cause and begin treatment early.

2. Kidney problems

Healthy kidneys filter ammonia and other waste from the blood. In cases of chronic kidney disease, this process is impaired, allowing ammonia to circulate and alter the odor of stool.
Associated symptoms may include:

  • High blood pressure
  • Swelling in limbs
  • Changes in urination frequency or color

Doctors may recommend kidney function tests and a low-protein diet to reduce strain on the organs.

3. High-protein diet

Excessive intake of meat, eggs, or dairy can cause an ammonia smell, as the body produces more nitrogen waste than it can expel through urine. This is common in individuals following strict high-protein or keto diets.
To restore balance:

  • Reduce animal protein and increase plant-based foods
  • Drink more water to help eliminate toxins
  • Avoid protein shakes with added creatine or nitrogen compounds

4. Gut infections and bacterial imbalance

Digestive infections or intestinal dysbiosis — an imbalance between good and harmful bacteria — can produce excess ammonia. Certain bacteria metabolize proteins and release nitrogen gas, which contributes to the smell.
Symptoms may include:

  • Bloating and cramps
  • Diarrhea or mucus in stool
  • A sudden change in appetite

Treatment often includes probiotics, dietary fiber, or medical antibiotics prescribed after stool analysis.

5. Metabolic disorders

Rare metabolic conditions such as urease deficiency or urea cycle disorders prevent the body from converting ammonia into urea, causing a dangerous buildup. This can lead to neurological symptoms if untreated.
Common signs:

  • Headaches and nausea
  • Mental confusion or drowsiness
  • General weakness

Consultation with a metabolic specialist or endocrinologist is necessary for diagnosis and therapy.

What to do if your stool smells like ammonia

Do not panic if you notice a temporary ammonia odor — first review your diet and hydration. However, if the smell persists for several days or is accompanied by other symptoms, consult your GP or gastroenterologist.

Steps to reduce ammonia odor:

  • Lower your protein intake temporarily
  • Drink at least 2–2.5 liters of water daily
  • Use probiotic supplements for gut balance
  • Avoid alcohol and processed foods that burden the liver
  • Keep regular medical check-ups for liver and kidney health

When to see a doctor

Seek immediate medical attention if ammonia odor appears together with:

  • Abdominal pain or bloating
  • Yellowish skin or eyes
  • Fever or swelling in legs
  • Loss of appetite or extreme tiredness

Ammonia smell in stool can range from benign to serious. While minor dietary adjustments often resolve it, persistent symptoms may reveal liver or kidney dysfunction that needs prompt treatment.

Read about the life of Westminster and Pimlico district, London and the world. 24/7 news with fresh and useful updates on culture, business, technology and city life: Why does my mouth taste like soap and how to stop it