Small black dots in the lungs with symptoms of coughing up blood, there is a possibility of cancer, but it is not a direct diagnosis, other diseases such as tuberculosis and other similar changes, need to be combined with a CT examination of the lungs as well as blood tests to make a comprehensive judgment, and the final diagnosis needs to be confirmed by pathological examination. The so-called small black dots in the lungs refers to nodules in the lungs, the appearance of nodules in the lungs along with coughing up blood to further investigate the symptoms of the lungs need to be examined through the CT examination, through the CT examination of the lungs have irregularity of the nodules or masses, the edges of the irregularity of the edges, can be seen in the lobes, burrs, vacuoles and other symptoms of malignancy, can be suspected of the possibility of cancer, through the biopsy of the puncture to carry out a pathology to determine the diagnosis. Once repeated coughing, coughing up blood, chest pain accompanied by low-grade fever and other symptoms, you need to consult a doctor in time, after determining the specific conditions to do standardized treatment.