Why you might feel off
Long periods of lifting and walking can mean substantial sweat loss. Dehydration can contribute to thirst, headache and dizziness, but fatigue and nausea can also be linked to heat illness, inadequate food, poor sleep or medical conditions. Symptoms alone cannot identify a sodium deficiency.
Why water is not always the whole story
For many workers, water plus normal meals covers routine hydration. With heavy sweating for several hours, drinks containing electrolytes may help replace sodium. Neither more water nor more sodium is always the answer, and excessive fluid intake can be dangerous.
Practical things to check
Consider whether you had regular access to drinks, food, breaks and cooling, and whether the shift was hotter or more strenuous than usual. Review any workplace heat plan. If symptoms recur, seek medical advice rather than repeatedly treating them with sports drinks.
When to get help
Stop work and get assistance if you feel faint or increasingly unwell. Confusion, collapse or seizures in the heat require emergency services and rapid cooling.
Sources and further reading
Read NIOSH heat-related illnesses, NIOSH prevention recommendations, and OSHA water, rest and shade guidance. This guide is educational and does not diagnose a condition.