A dry cough is a type of cough that does not produce mucus or phlegm. It can be caused by various factors, including allergies, irritants in the air, or viral infections like the common cold. Unlike a productive cough, which helps clear mucus from the airways, a dry cough can be uncomfortable and may lead to a sore throat. Treatment for a dry cough often focuses on relieving symptoms. Over-the-counter medications, such as cough suppressants, can help reduce the urge to cough. Staying hydrated and using a humidifier may also provide relief by soothing the throat and airways.