<unk>  can develop in several different ways depending on the underlying cause of the disease. Eosinophils play a central role in defending the body against infection by parasites. Many diseases, such as asthma and eczema, are caused when eosinophils overreact to environmental triggers and release an excess of chemicals, e.g., cytokines and histamine. The common characteristic among different causes of<unk>  is eosinophil overreaction or dysfunction in the lungs. Medications and environmental exposures Medications, substance abuse, and environmental exposures may all trigger eosinophil dysfunction. Medications such as nonsteroidal anti-inflammatory drugs (e.g., ibuprofen), nitrofurantoin, phenytoin, L-tryptophan, daptomycin and ampicillin, and drugs of abuse such as inhaled heroin and cocaine may trigger an allergic response which results in<unk> . Chemicals such as sulfites, aluminum silicate, and cigarette smoke can cause<unk>  when inhaled. A New York City firefighter developed<unk>  after inhalation of dust from the World Trade Center on September 11, 2001. Parasitic infections Parasites cause<unk>  in three different ways. Parasites can either invade the lungs, live in the lungs as part of their life cycle, or be spread to the lungs by the bloodstream. Eosinophils then migrate to the lungs in order to fight the parasites, and cause<unk>  when they release their contents. Important parasites that invade the lungs include Paragonimus lung flukes and the tapeworms Echinococcus and Taenia solium. Important parasites which inhabit the lungs as part of their normal life cycle include the worms (helminths) Ascaris lumbricoides, Strongyloides stercoralis and the hookworms Ancylostoma duodenale and Necator americanus. When<unk>  is caused by helminths, it is often called "Löffler's syndrome". The final group of parasites cause<unk>  when their eggs are carried into the lungs by the bloodstream. This can include Trichinella spiralis, Strongyloides stercoralis, Ascaris lumbricoides, the hookworms, and the schistosomes. Acute and Chronic<unk>  The causes for both acute and chronic<unk>  are unknown as of 2005. There is some suspicion that at least the acute form is the result of the body's response to some unidentified environmental agent.
Eosinophilic pneumonia
Atypical pneumonia
Acute eosinophilic pneumonia
Lipid pneumonia
Cryptogenic organizing pneumonia
Lobar pneumonia
Parasitic pneumonia
Fungal pneumonia