8 Early Signs of Asymptomatic COVID-19

　　"New coronavirus" generally refers to novel coronavirus infection. There is no such thing as "eight early signs of asymptomatic novel coronavirus infection," because asymptomatic cases do not exhibit any discomfort or symptoms, and therefore there are no so-called warning signs. When an asymptomatic case progresses to a symptomatic one, possible manifestations may include loss of smell or taste, muscle pain, fever, cough, fatigue, and others. The details are as follows:

　　1. Loss of smell or taste: Loss of smell or taste is a hallmark symptom of novel coronavirus infection. Even in the absence of other obvious symptoms, sudden loss of smell or taste should raise suspicion.

　　2. Muscle pain: Mild to moderate muscle aches or joint pain may appear early in the infection, which is related to the systemic inflammatory response triggered by the virus.

　　3. Fever: The novel coronavirus enters through the respiratory tract, causing upper respiratory tract infection, which can lead to a systemic inflammatory response. This shifts the set point of the body's temperature regulation center upward, resulting in more heat production than dissipation, thereby causing fever.

　　4. Cough: After invading the human body, the novel coronavirus often affects the lower respiratory tract and lungs, causing congestion and edema of local mucosal tissues, thus triggering a cough reflex. The cough is typically dry.

　　5. Fatigue: Following infection with the novel coronavirus, the body sustains certain damage. Inflammatory mediators may impair respiratory function, leading to fatigue, manifested as reduced physical strength and general lethargy.

　　If any discomfort occurs, it is recommended to seek medical attention at a hospital promptly and follow the doctor’s instructions for treatment.