As the pressure increases, the eardrum may break open (rupture). Damage to the eardrum can also occur from: 1  A very loud noise close to the ear, such as a gunshot. 2  A rapid change in ear pressure, which may occur when flying, scuba diving, or driving in the mountains.  Foreign objects in the ear.
Constant headache: Introduction. Constant headache: Constant headache is a steady and continual discomfort in the head. See detailed information below for a list of 9 causes of Constant headache, Symptom Checker, including diseases and drug side effect causes. Â» Review Causes of Constant headache: Causes | Symptom Checker Â».
About Cluster Headaches. Cluster headache-the most severe form of primary headache-involves sudden, extremely painful headaches that occur in clusters, usually at the same time of the day and night for several weeks.luster headaches are characterized by excruciating, piercing pain on one side of the head and eye; they occur more frequently in men than women. PubMed Health Glossary. (Source: NIH-National Institute of Neurological Disorders and Stroke). Part of: Primary Headaches.