Can I run when I have a fever from a cold?
Generally speaking, whether one can run when having a cold and fever depends on the severity of the illness. If the condition is mild, running is usually acceptable; however, if the condition is severe, running should be avoided. A detailed explanation is as follows:

If cold symptoms are mild, with only slight runny nose and sore throat, and body temperature does not exceed 38℃, light aerobic exercises such as jogging may be performed. Appropriate physical activity can promote blood circulation, enhance immunity, and help the body fight against viruses.
When the cold and fever are severe, accompanied by high fever, severe cough, phlegm production, body weakness, chills, and other symptoms, it indicates a strong immune response. At this stage, the body consumes significant amounts of energy and calories. Running would further increase physical strain, making the immune system even more fatigued, potentially leading to increased tiredness, dizziness, and worsening of cold and fever symptoms.
During the recovery period, it is important to develop healthy lifestyle habits and avoid engaging in strenuous physical activities. In terms of diet, it is advisable to consume more fresh vegetables and fruits to ensure adequate nutrition, which supports recovery from the illness.