Small nodules in the lungs can be caused by many reasons, such as infection, including bacteria, tuberculosis, fungus and other causes can be caused, the milder ones can be self-healing, the more serious ones need regular hospital treatment to get the possibility of healing. Small nodules in the lung can be caused by a variety of bacterial infections, the most common of which can be coughing, coughing up sputum, coughing up blood and chest pain, most people are asymptomatic and are found during health checkups. The nodules may be asymptomatic. If the nodule grows up, it should be taken seriously and diagnosed by puncture if necessary. For inflammatory or tuberculous nodules, active anti-inflammatory or anti-tuberculosis treatment will lead to remission or even healing. In general, there is no need to worry too much about small nodules in the lungs, but it is important to go to the hospital and listen to the doctor’s advice, and not to take any chances.