Headache, general weakness, aches and pains, and chills may be caused by fever, which can be caused by a variety of diseases, such as bacterial and viral infections. Bacterial infections include meningitis, pneumonia, tonsillitis, urinary tract infections, etc. The main treatment is antibacterial, usually cephalosporin antibiotics, and if necessary, bacterial culture and targeted antibiotic treatment. If viral infection is considered to be the cause, clinically common diseases include encephalitis and upper respiratory tract infection, mainly antiviral treatment, patients with encephalitis can apply acyclovir and ganciclovir, upper respiratory tract infection can be treated with oseltamivir, along with symptomatic supportive treatment.