Lung ct solid nodule 3mm clear border is generally not serious, but can not be generalized, the specific circumstances need to be combined with its other characteristics and nature (benign and malignant) to distinguish. If the solid nodule is less than 3mm and the border is clear, the shape is regular, there is no obvious discomfort symptoms, generally belongs to the benign nodule, not serious, do not need to carry on the special treatment, regular to the hospital to review can be. Solid nodules on the lungs is usually due to inflammation, tuberculosis and other causes, if greater than 3mm, irregular shape, and have obvious pain, cough and other symptoms, may be malignant nodules, to the hospital in time for a detailed examination, diagnosis and treatment of the cause. Lung ct solid nodule 3mm border clear, generally do not need to worry too much, close observation can be. In daily life, you need to quit smoking and drinking, and keep the indoor air circulation, so as to avoid aggravation of the condition. If you find small nodules in the lungs, please go to the regular hospital in time, and actively diagnosis and treatment, so as not to delay the condition.