Weakness during fever is mainly caused by upper respiratory tract infection caused by virus or bacteria. You need to drink more water, pay attention to rest, take vitamin C and eat more food with high protein content, such as milk and eggs, which can replenish the energy consumed by the fever. You can take oral anti-cold medications, such as MeiYi pseudo-lax capsules and cold granules, which can relieve and treat various symptoms caused by cold. Chinese medicine can also be used to treat the cold, such as Pu Di Lan Anti-inflammatory Oral Liquid, Lian Hua Qing Hui Granules, Qing Kai Ling Granules, Ban Lan Gen Granules, etc., which have the ability to clear heat and detoxify. In Chinese herbal soup, for fever of wind-cold cold, use Jing Fang Wei Po Poison San plus or minus; for fever of wind-heat cold, use Yin Qiao San plus or minus.