Pneumonia is a serious lung infection that causes inflammation of the air sacs in the lungs, causing coughing, chest pain, and difficulty breathing.

It can be caused by a variety of microorganisms, including bacteria, viruses, fungi and parasites.

Pneumonia varies in severity from mild to life-threatening, and can affect people of all ages, although it is especially dangerous for young children, the elderly, and people with weakened immune systems.

Symptoms of pneumonia usually include a persistent cough, chest pain, fever, sweating and chills, rapid breathing, and fatigue.

In severe cases, the victim may experience confusion, low blood pressure, and blue skin due to lack of oxygen.