Symptoms can be classified in various ways: - Acute vs. Chronic: Acute symptoms appear suddenly and are often severe, while chronic symptoms develop gradually and persist over time. - Localized vs. Systemic: Localized symptoms affect a specific part of the body, whereas systemic symptoms affect the entire body. - Objective vs. Subjective: Objective symptoms can be measured or observed by others, such as a fever, while subjective symptoms are felt only by the individual, such as fatigue.