There is no specific time for how long it takes to cough up blood in sputum to be lung cancer. The degree of coughing is more intense, which cannot be relieved by conventional treatment, and it takes more than two weeks to go to the hospital immediately and be diagnosed by the doctor.
Early symptom of lung cancer is coughing with blood in sputum, but coughing with blood in sputum is not necessarily lung cancer. For coughing patients who have been coughing for more than 8 weeks, they should undergo lung cancer screening in time to confirm whether there is any lesion in the lung. Some lung cancer patients may have no symptoms of coughing and need to go to the hospital for regular medical checkups to find out whether there is lung cancer or not, so whether there is lung cancer or not cannot be judged by the length of time of coughing up blood in sputum.
Moreover, blood in cough sputum is not necessarily lung cancer. Blood in sputum is a common respiratory symptom, which can also be seen in tuberculosis, bronchitis, bronchial dilatation, fungal infections, etc. If you have the symptom of coughing up blood in sputum, you should go to the hospital in time, cooperate with the doctor to do auxiliary examination, clarify the cause of the disease, and then take symptomatic treatment.