Parasites entering the lungs can cause inflammatory reactions in the lungs, commonly roundworms, hookworms, schistosomes and schistosomes. The above mentioned parasites mainly cause hemorrhage, inflammation and allergic reaction through their larvae piercing through the tissues, with increased blood eosinophils. It mainly enters through the capillaries or mucous membranes of the lungs, and patients may have symptoms of coughing, coughing up sputum, chest pain and chest tightness. If secondary bacterial infection can also appear symptoms of persistent elevation of body temperature, can be treated with deworming drugs, most cases can be cured.