Quacks are individuals who perform medical treatments or prescribe remedies without formal education or licenses. Quackery involves using unscientifically accepted methods to treat illnesses. Following quackery can be dangerous as the ill person may not receive real treatment and their condition could worsen or they could die. Traditional and alternative medicines refer to health practices using plants, animals, minerals, or spiritual therapies. While some have benefits, people should be wary of false health claims from quacks.