Sore throats can be caused by injuries, irritants, bacterial infections, or viral infections. If you trip or fall while walking with a sharp object, you can cut or pierce the throat. This type of injury causes throat discomfort and other symptoms. Exposure to irritants such as cigarette smoke and air pollution can cause hoarseness and sore throat, as can postnasal drip and low levels of moisture in the air. If bacteria get into your throat, they can cause bacterial infections. Strep throat is one of the most common throat infections caused by bacteria. Epiglottitis, tonsillitis, and uvulitis are also caused by bacterial organisms. Sore throats are most often caused by viruses, so antibiotics are not always necessary. Viruses can cause laryngitis, mononucleosis, or the common cold. Mumps and influenza can also cause a sore throat. If you develop ear, nose, and throat problems, or you undergo a pre-employment physical exam that produces potentially concerning results, see a provider as soon as possible.