What causes pain in half of the face and eye?

Pain in half of the face and eye may be caused by conditions such as facial neuritis, trigeminal neuralgia, or cerebral infarction. Appropriate treatment should be selected based on the specific underlying cause.

1. Facial Neuritis: Facial neuritis is usually caused by infection with pathogens such as varicella-zoster virus or herpes simplex virus. Patients commonly experience pain in half of the face and the eye. Treatment may include medications such as dexamethasone sodium phosphate injection or ribavirin injection, used under a doctor's guidance.

2. Trigeminal Neuralgia: Trigeminal neuralgia is typically caused by compression of the trigeminal nerve. Patients may also experience pain in half of the face and the eye. Medications such as phenytoin tablets or carbamazepine tablets may be used as directed by a physician.

3. Cerebral Infarction: If cerebral infarction occurs due to conditions like cerebral arteriosclerosis, it may also lead to pain in half of the face and the eye. Treatment may involve medications such as ligustrazine hydrochloride injection or Xueshuantong injection, administered under medical supervision.

In addition, other conditions such as glaucoma or eyelid gland inflammation (hordeolum) may also cause pain in half of the face and the eye. Patients are advised to follow medical guidance for proper treatment.