why is my snot green

Green snot typically means that your body is fighting an infection. The green color comes from dead white blood cells (specifically neutrophils) that have been working hard to combat bacteria or viruses in your nasal passages. These white blood cells release a green-colored protein that colors the mucus. This is a sign your immune system is actively responding to the infection. Common causes of green snot include a cold, sinus infection, or other upper respiratory infections. It often indicates the infection is a bit stronger or more advanced. However, green mucus does not necessarily mean a bacterial infection; viral infections can cause it too. If green snot persists for longer than about 10 to 12 days or is accompanied by severe symptoms such as high fever or intense facial pain, it is advisable to see a healthcare provider for evaluation.