A cough with a cold starting suddenly since morning is usually due to a viral infection or sometimes exposure to dust, weather change, or irritation in the throat and nose, and in most cases it improves on its own within a few days as the body fights the infection. The main aim right now is to ease symptoms like a runny nose, throat irritation, and cough so you feel more comfortable during recovery. Staying well hydrated, taking warm fluids, and resting your voice can help reduce throat irritation and loosen mucus naturally. Steam inhalation may also give quick relief by clearing nasal blockage and soothing the airway. Over-the-counter cold and cough medicines are sometimes used for symptom relief, but the choice depends on your exact symptoms, such as whether the cough is dry or with phlegm, and whether fever is present. Because different combinations can cause side effects like drowsiness or dryness, it is better not to self-select strong combinations without guidance. If symptoms worsen, persist beyond a few days, or you develop high fever, breathlessness, chest pain, or thick yellow-green sputum, it is important to get checked to rule out bacterial infection or chest involvement.