According to the CDC, early signs and symptoms of heat loss include:
- Shivering (first, most common symptom)
- Fatigue
- Loss of coordination
- Confusion and disorientation
Late symptoms of heat loss include
- No shivering
- Blue skin
- Dilated pupils
- Slowed pulse and breathing
- Loss of consciousness
If enough heat loss occurs, signs and symptoms of the resulting hypothermia include:
- Cool skin
- Slower, irregular breathing
- Slower heartbeat
- Weak pulse
- Uncontrollable shivering
- Severe shaking
- Rigid muscles
- Drowsiness
- Exhaustion
- Slurred speech
- Memory lapses
Source:
- Center for Disease Control and Prevention; NIOSH Workplace Safety and Health Topics; Cold Stress