When the weather is bad, many people are likely to get sick. Nowadays, pollution is more serious, especially when it is foggy, which is most likely to cause cough. In fact, besides colds, other diseases can also cause coughing with phlegm. 1. Cold. This is more common, due to cold or infected with a cold will cough, some people will also appear to cough with phlegm. This is relatively simple to treat, prescribe some targeted drugs can be almost well. 2. Laryngitis. This is also considered a relatively common, most likely because of the infection of bacteria. In spring, all kinds of viruses are rampant, one can get laryngitis, and it is likely that in addition to coughing, there are other very headache symptoms, to seek timely medical attention. 3. Bronchitis. Bronchitis is also a respiratory infection, which may be due to a virus or bacteria at work. At the very beginning the cough is not that strong, after that if there is no treatment, the cough may become more and more powerful, and the phlegm will increase. Having said that, I believe you have an idea about coughing with phlegm, and if you really feel uncomfortable, you must see your doctor in time.