Bell's palsy
Bell's palsy  usually cures itself, sometimes in a few weeks. The hallmark of this condition is a rapid start of partial or complete paralysis that often occurs overnight. It is thought that an inflammation leads to swelling of the facial nerve. The nerve travels through the skull in a narrow bone canal beneath the ear. Nerve swelling and compression in the narrow bone canal are thought to stop the nerve from working. Sudworth, John 2012.