A cough with phlegm usually means your body is trying to clear mucus from the airways, often due to a viral infection, cold, or bronchitis. In this situation, cough syrups that help loosen and bring out phlegm, known as expectorants or mucolytics, are generally more useful than dry cough suppressants. Medicines containing ingredients such as guaifenesin or ambroxol are commonly used to thin mucus so it can be coughed up more easily. These can provide relief, but they do not cure the infection itself. Along with syrup, drinking plenty of warm fluids such as water, soups, and herbal drinks can help clear mucus naturally. Steam inhalation may also ease chest congestion. Avoid cough syrups that strongly suppress cough if you have a lot of phlegm, as this may trap mucus inside the chest. You should also avoid smoking and dusty environments, as they can worsen symptoms. If your cough lasts more than 1 to 2 weeks, or if you have a high fever, breathlessness, chest pain, or blood in your sputum, please see a doctor for proper evaluation.