A heavy, dry cough with throat pain is commonly caused by a viral infection (cold or flu), throat inflammation (pharyngitis or laryngitis), or irritation from dust, smoke, or allergies. It may also occur due to post-nasal drip or acid reflux affecting the throat. You can relieve it by drinking warm fluids, gargling with salt water, resting your voice, and using honey or paracetamol for pain relief. If needed, over-the-counter lozenges or cough suppressants may help reduce coughing. Please see a doctor if your cough lasts more than two weeks or if you develop chest pain or shortness of breath.