Pulpitis can cause headaches. Pulpitis is caused by the progression of dental caries, and it is the natural outcome of dental caries. Bacterial infections cause the dental nerve to become purulent and necrotic, or cause an acute inflammatory response in the dental nerve, which is pulpitis. The clinical symptoms of pulpitis include pain stimulated by hot and cold, which becomes more noticeable when consuming hot or cold food, or the pain may be non-localizable, which is also a typical symptom of pulpitis. It often happens that if one tooth suffers from pulpitis, the pain may occur in teeth on the same side of both the upper and lower jaws, and it is unclear which specific tooth is causing the pain, due to the non-localizing nature of pulpitis. Additionally, sometimes the pain may radiate towards the ear causing headaches, which is why pulpitis can lead to headaches.