1. Onset (Cold or Chill Phase): Increased heart rate, increased respiratory rate and depth, shivering, pallid cold skin, complaints of being cold, cyanotic nailbeds, "gooseflesh" appearance, cessation of sweating
2. Course (Plateau Phase): Absence of chills, warm skin, photosensitivity, glassy-eyed appearance, increased pulse and respiratory rate, increased thirst, mild to severe dehydration, drowsiness, restlessness, delirium or convulsions, herpetic lesions of the mouth, loss of appetite, malaise, weakness and aching muscles
3. Defervescence (Fever Abatement/Flush Phase): Flushed warm skin, sweating, decreased shivering, possible dehydration