Why do I feel faint after heavy manual work?

What could cause it? why does it happen?

Appreciate any information.

Thank you.

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Answer:
Dehydration and you might need a snack for sugar.

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Answer:
Fainting is a temporary loss of consciousness due to a drop in blood flow to the brain. The episode is brief (lasting less than a couple of minutes) and is followed by rapid and complete recovery. You might feel lightheaded or dizzy before fainting.

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Answer:
i dont think mr-k is a teenager? forgive me if im wrong just by your questions you seem older.

like each one states make sure you’ve enough fluids and sugary snacks and take breaks but if this is persistently happening i would ggo check it out at the doctors x

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Answer:
There might due to many reason: 1. Have you taken your meal before work? 2. Have you taken enough water? 3. Do you sick? 4. There might due to other reason and need to go for proper check up.

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Answer:
It's possible it's your spine, most likely caused by poor posture. Heavy lifting above your head can put pressure on a nerve in your back that induces sleepiness.

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Answer:
Because you’re a teenager?

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Answer:
you may need more water or fluids.

breaks are important too.