Colds do not get better for a long time to consider repeated colds, serious viral infections, or have a combination of rhinitis, bronchitis pneumonia and other causes. 1. Repeated colds: mostly seen in the immune system is relatively poor, or seasonal changes and poor environmental factors, improper care, can lead to the cold has not been completely cured and repeat colds, there may be a cold symptoms and a sudden aggravation of the symptoms, such as fever, headache, clear nose, nasal congestion, and other symptoms have aggravated and repeated. 2. Severe viral infections: for example, EBV infection, there will be fever, runny nose, cough and other cold symptoms, but the course of the disease is relatively long, with recurrent fever and lymph node enlargement and other discomforts, you need to go to the hospital to further do the virus antibody related tests. 3. The emergence of comorbidities: some patients with colds will have repeated nasal congestion and runny nose for more than two weeks, considering that there is rhinitis or sinusitis; some of the recurrent coughing, coughing up sputum and even wheezing and other symptoms, we should consider the emergence of bronchitis, pneumonia and other complications. General cold 1 ~ 2 weeks to heal, more than two weeks or symptoms worsening, it is recommended to go to the hospital for further consultation and examination, to clarify the cause of the disease after standardized treatment.