Symptoms. Walking pneumonia is precipitated by pathogens that invade and infiltrate the breathing passageways of the lungs. Therefore, stricken individuals often experience a variety of respiratory manifestations including breathing difficulties, chest tightness and coughing that might linger for several weeks. Afflicted persons may also experience other symptoms such as a mild but elevated body temperature, chills, body aches, fatigue and appetite loss. There are notable differences between walking pneumonia and the much more serious typical form of the disease. Typical pneumonia usually causes a high fever and coughing that produces significant quantities of mucous.