Blood within the mucus. Pneumonia is often observed through coughing and hacking. In a few cases, there might be small quantities of blood in the mucus, and this situation is known as hemoptysis. Bubbles may additionally appear inside the mucus, which takes place when oxygen molecules engage with the mucus and blood. In case that you have already been identified with pneumonia, your doctor can also prescribe medicinal drugs in an effort to prevent this on early stages.