What causes coughing with phlegm and an itchy throat?

Cough with phlegm and an itchy throat can have various causes, potentially involving multiple respiratory diseases. Specifically, these symptoms are commonly seen in colds, acute and chronic pharyngitis, tracheitis, and other conditions. The underlying mechanisms are often related to infections or inflammation affecting the bronchial or tracheal mucosa, which leads to coughing, throat itching, and secretion of phlegm. In addition, allergic conditions such as cough variant asthma and allergic pharyngitis may also cause similar symptoms. If symptoms persist or are accompanied by other severe discomforts, timely medical consultation is recommended. The underlying cause can be identified through relevant examinations, such as a complete blood count (CBC) or chest CT scan, followed by targeted treatment under a doctor's guidance. Keeping indoor air fresh and humid, avoiding irritating foods and gases, and drinking an adequate amount of water may help alleviate symptoms. Practicing good personal hygiene and enhancing immunity can help prevent colds and other respiratory infections.