Heat stress causes muscle cramps, dizziness when blood flow of brain is stagnated, and nauseous and stomachache when stomach and intestines loose moisture. Its symptoms are various and classified in 3 categories based on symptoms in Japan.


【Classification of heat stress】

ーCategory Ⅰ/ mild symptomsー
・Mainly dehydration / fever is not server
・Nauseous and dizziness caused by dehydration of brain
・Decreased appetite, nauseous, and stomachache caused by dehydration of stomach and intestines
・Muscles loose hydration causing cramps, pain, and numbness

ーCategory Ⅱ / moderate symptomsー
・Sudden rise in body temperature
・Blood flow stagnated resulting not enough oxygen and nutrition supplied to brain causing headache, nauseous, and vomiting
・Nauseous=Category Ⅰ　　Nauseous and vomiting=Category Ⅱ
・Blood flow stagnated resulting not enough oxygen and nutrition supplied to body cells and organs causing sense of fatigue

ーCategory Ⅲ / critical symptomsー

・Body temperature raised up to around 40 degrees
・Brain, muscles, and organs severely damaged
・Unconsciousness, cramps, and lowering blood pressure
・If you do not receive a proper treatment or treated in time, it may lead to death by multi-organ failure

ーCall an ambulanceー
The symptoms are high body temperature, sweating severely, nauseous, and headache as well as no response/unconsciousness
*Unconsciousness is extremely dangerous and require immediate action

ーSee a doctorー
If you can hardly drink fluid and hydrate your body yourself or your symptoms does not get better even after drink fluid and hydrating your body, and consuming salinity, you need to see a doctor and receive a treatment

If you do not receive proper treatments and rest well to fully recover from heat stress, you may suffer heat stress again with even more server symptoms afterwards. Suffering from heat stress and rested a little bit feeling slightly better is dangerous. You must not be overconfidence thinking you are fine. Your body need to fully recover from heat stress.