One side of the headache ear pain may be due to trigeminal neuralgia, pulpitis, otitis media, etc. It is recommended to go to the hospital for specific examination and treatment. 1. Trigeminal neuralgia will produce headache when it affects the ophthalmic branch; it may bring earache when it affects the maxillary branch; it may cause masticatory muscle dyskinesia when it affects the mandibular branch. 2. Pulpitis has spontaneous pain, radiating pain, and usually carries pain on one side of the face and head, including the ear, because the pulp pain is connected to the trigeminal nerve. 3. Otitis media may have tinnitus, ear pain, due to inflammation stimulation of the cranial brain, there may be headache performance. Prompt examination is recommended to avoid affecting hearing.