Environment / Situation

Spent a long time in a hot place or exercised in the heat

Could not drink enough fluids

Had diarrhea, vomiting, or fever recently

Current Symptoms

Feeling drowsy or confused

Feeling dizzy or lightheaded

Feeling very thirsty

Nausea or vomiting

Muscle cramps

Seizures or convulsions

Headache or feeling dazed

Excessive sweating or no sweating at all

Decreased urine output

Dark-colored urine

Loss of appetite