There are several feasible reasons for the blockage of ear and out of many possibilities, infection, minor injuries, allergen, and insertion of foreign objects etc. stand first in this category...

Earwax is a natural product of body which helps in protecting the ear canal. This natural product is made of skin, hair, debris [dirt and shampoo], and sweat together forming a fluid like substance secreted by glands inside the ear canal. The ear canals have self-cleaning quality...