What Are the Common Causes of Green Pus?

Picture this: You’re dealing with a wound or an infection, and suddenly, you notice something unusual — green pus. Green pus might look like something from an alien movie, but it’s a sign your body is fighting back in its own remarkable way. So, what exactly causes green pus, and when should you be concerned?

Understanding Pus

Firstly, let’s get a basic understanding of pus. Pus is a blend of dead white blood cells, bacteria, and tissue debris. It’s a common sign of infection and part of your body’s natural defense mechanism. But why does it sometimes turn green?

Causes of Green Pus

Green pus is generally a sign of a bacterial infection. The green color can actually be attributed to a protein called myeloperoxidase, which is found in certain white blood cells. Let’s dive into the common causes:

1. Bacterial Infections

Pseudomonas Aeruginosa

This type of bacteria is a common cause of green pus. Pseudomonas infections are known for their greenish-blue pigment and can occur in various parts of the body, including the ears, skin, and respiratory system.

Staphylococcus Aureus

Another bacteria that can lead to green pus, particularly in skin abscesses or boils. While not all Staph infections produce green pus, it’s a potential indicator.

2. Chronic Wounds or Abscesses

Chronic wounds, like those in diabetic patients or non-healing ulcers, can sometimes produce green pus. This is often due to a persistent infection that requires medical attention.

3. Sinus Infections

Sinus infections, especially those that are long-standing or severe, can produce greenish nasal discharge, which is similar to pus in its composition.

4. Respiratory Infections

Infections like bronchitis or pneumonia, especially when caused by specific bacteria, can lead to the production of green sputum, which, while not pus in the strictest sense, shares similar characteristics.

When to Seek Medical Attention

While green pus is a sign of your body fighting infection, it’s also a cue to pay attention. Here are some scenarios where medical advice is crucial:

  • Persistent Infections: If the infection doesn’t improve or worsens over time.
  • Fever or Severe Symptoms: Accompanied by high fever or severe body aches.
  • Compromised Immune Systems: For individuals with weakened immune systems, even minor infections can be serious.


Green pus, while startling, is a sign of your body’s battle against infection. It’s essential to monitor the situation and seek medical help if the infection persists or is accompanied by other severe symptoms. Remember, your body is an amazing defender; sometimes, it just needs a little backup from modern medicine. Keep an eye on the color and duration of pus to stay informed about your health.

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