Frequent colds may be caused by diabetes, sinusitis, leukemia and other diseases. 1. diabetes: when patients have diabetes, due to metabolic disorders and blood sugar fluctuations, it can lead to a decrease in the body’s resistance, which can easily lead to the invasion of pathogens, resulting in frequent colds. 2. sinusitis: sinusitis patients often have cold-like symptoms, such as nasal congestion, runny nose, headache, fever and other symptoms, due to recurrent episodes, may be mistaken for frequent colds. 3. Leukemia: When leukemia cells proliferate in large numbers in the body, destroying the normal immune function and causing the patient’s immune system to appear to be lowered, when invaded by viruses, frequent colds will occur, and headaches, nausea, and bleeding from the nose may also occur. There are many other diseases that cause frequent cold symptoms, if the patient has frequent cold symptoms, it is recommended to go to the hospital in time, early formal treatment, to avoid aggravation of the condition, which will have an impact on the body’s health.