Infection in both lower lungs indicates inflammation in both lungs and is commonly caused by bacterial pneumonia as well as mycoplasma pneumonia and rickettsial pneumonia due to bacterial infection. Pneumonia requires routine blood tests and even sputum culture if necessary, so that the cause of the infection can be clarified and symptomatic treatment can be done after the infection is known, with antibiotics for anti-inflammatory treatment and cough suppressants to help expel the sputum. When there is a double lower lung infection must pay attention to the lung inflammation symptomatic treatment in order to recover as soon as possible, if remain untreated is likely to cause other diseases of the lungs.