Hi, Thank you for your question. For constant headaches, possibilities like migrainous, cluster, tension, tumor, pinched nerve in cervical spine and refractive errors that need to be evaluated thoroughly with the help of a neurologist here. Migraine like headache can be throbbing, one sided of face & head and preceded by aura (starts with blurred vision). Cluster headache may appear as burning, explosive in nature and tear appears from eyes.