Tonsillitis is an infection of the tonsils that causes sore throat and fever. It can be caused by bacteria like streptococcus or viruses. Symptoms include sore throat, painful swallowing, fever, and swollen tonsils. The document provides 18 home remedies for tonsillitis involving gargling with mixtures of herbs, plants, fruits, vegetables, honey, and other natural ingredients boiled in water. Common ingredients mentioned are sage, cabbage, salt, lemon, and radishes.