For an adult, a fever may be uncomfortable, but usually isn't a cause for concern For infants and toddlers, a slightly elevated temperature may.
Rectal, ear or temporal artery temperature of 100.4 (38 C) or higher Adults with fevers of 103 F (39.4 C) or higher will generally look and act.
A fever is a body temperature of 100.4 F or greater. Read about causes of fever in adults, symptoms, treatment, medications that may cause fevers, and different.
Fever in Adults - Learn about the causes, symptoms, diagnosis & treatment from the MSD Sometimes temperature peaks every day and then returns to normal.