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».
The main types of primary headaches are: 1  Tension headache â This is the most common type of headache, suffered by approximately 90 percent of the population at some time or other. 2  Migraine headache â The next most common type of headache, migraines affect approximately 28 percent of the population. Cluster headache â The rarest of the primary headaches are cluster headaches, which affect less than one percent of the population.