Heat exhaustion (when the body overheats) - Seniors
What it is
During extreme temperatures or intense physical activity in a hot environment, the body may have trouble cooling itself. When the body overheats, you may have a headache, diarrhea, vomiting, or cramps in the arms, legs or stomach.
What you can do at home
What to do
- Go to a cool place such as an air-conditioned or well-ventilated room or a shady spot as quickly as possible. Lie down and rest there.
- If you are dizzy, lie down and raise your legs above the level of your heart (for example, put a cushion under your legs).
- If you have cramps, loosen your clothing and gently massage the sore muscle.
- Unless a healthcare professional has told you otherwise, drink water, an oral rehydration drink from a pharmacy (Pedialyte, Gastrolyte), or a home-made solution:
- 360 ml unsweetened orange juice
- 600 ml boiled water, cooled
- 2.5 ml (½ tsp) salt
Avoid
- Avoid intense physical activities for at least 12 hours.
When to seek medical attention
If you have any of these signs:
- You are dizzy;
- You have diarrhea or persistent vomiting;
- A healthcare professional has already told you to limit your fluid intake;
- You have shivers or your temperature is less than or equal to 38.5 °C (101.3 °F) taken orally OR 40 °C (104 °F) taken rectally.
Call 811, Option 1, to speak with a nurse, or contact a healthcare professional (pharmacist, doctor, or nurse practitioner).
When to go to the hospital right away
If your:
- Rectal temperature is above 40 °C (104 °F).
- Or your oral temperature is above 38.5 °C (101.3 °F).
You feel that it is:
- it’s harder than usual to stay awake or you respond less to what is going on around you;
- you are confused, agitated, or see or hear things that aren’t real;
- your behaviour changes suddenly or is not the same as usual.
You have had convulsions (body shaking uncontrollably).
You aren’t feeling better or you are feeling worse despite following the advice given above.
You are very thirsty and you haven’t urinated (peed) in over 12 hours.
Need help?
Call Info-Santé at 811, Option 1, to speak with a nurse at any time.
Go to the pharmacy for advice on medications or treatment.
Make an appointment at your medical clinic or CLSC.
If you do not have a family doctor, go to https://gap.soinsvirtuels.gouv.qc.ca/en or call 811, Option 3.
Last update: January 1, 2026
The information sheet does not replace medical advice. If you have any doubts, contact a healthcare professional.
References:
- Guides infirmiers d’éducation aux autosoins, CIUSSS de la Capitale-Nationale
See also
See the details of Gastroenteritis
Gastroenteritis
- Infants
- Children
- Adults
- Seniors
See the details of Superficial Wound
Superficial Wound
- Infants
- Children
- Adults
- Seniors