Tonsillitis is a disease. It is also known as pharyngitis, laryngitis and Tonsillar infection. Tonsillitis is caused by either a virus or bacteria. It is the inflammation and infection of the tonsils. The tonsils are in the back of the throat. The tonsils get inflamed and red. Other symptoms include headaches, fevers, back and neck aches, chills, bad breath, weak voice, fatigue, having trouble swallowing, and more. There are treatments for tonsillitis. One treatment is antibiotics. Medicines to relieve pain like Tylenol and Advil are also suggested. The tonsils may be removed surgically if it is medically necessary. This operation is called a "tonsillectomy". It is the most effective way to get rid of the infection. All kinds of tonsillitis are contagious. Tonsillitis is spread by human contact.