The phlegm is hard lumps, probably because the phlegm is retained in the respiratory tract for a longer period of time, which can cause the phlegm to continue to air-dry when breathing air, making the phlegm less watery, which can cause it to look like hard lumps. It can be seen in acute bronchitis, pneumonia, bronchial asthma and other diseases. 1. Acute bronchitis: acute bronchitis is mostly caused by pathogen infection, chemical stimulation, cold, excessive fatigue, etc. The main symptom is coughing up sputum, and the patient’s early stage is mostly a small amount of white mucous sputum, with the development of the disease can appear to cough up yellow sputum, and occasionally sputum will be accompanied by blood. 2. Pneumonia: Pneumonia may be caused by air pollution, impaired immune function, long-term smoking, and bacterial and viral infections, etc. The main symptoms are shortness of breath, coughing, coughing up sputum. 3. Bronchial asthma: bronchial asthma is mostly related to genetic, environmental, medication and other factors, may also be caused by the lack of trace elements, respiratory tract infections, etc., the main symptoms manifested as chest tightness, wheezing, coughing, coughing up sputum and so on. The sputum is hard lumps may have other reasons, it is recommended that the regular hospital in a timely manner, a comprehensive examination, a clear diagnosis under the guidance of the physician standardized treatment.