Why does my maximum stamina lowers during a mission?

I've noticed this a couple times now that during a mission my max stamina is suddenly lower then it was before, up to a point where I run out of stamina after a running for half a second.
What causes this and how can I get back to a bigger stamina bar? It is pretty detrimental to my damage output and general survival.
Best Answer
In all the Monster hunter series in normal condition stamina decreases for 25 roughly every 8 min of play, double the rate in cold climates.
To replenish the stamina you can use ingame food, like the rations that you can get in the blue chest at the begining of the mision, every mission ration gives 25 points of stamina
You can bring or cook well done steaks or rare steaks . well done steaks give 50 points of stamina and rare steaks 25 points of stamina
to cook these steacks you need a grill and some raw meat, and play a minigame.
There exist other food and items that can replenish and give extra effects but they are rather advanced, i think that for the moment the basic stuf can help a lot
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Why does stamina go down in Monster Hunter?
Actions like running, dodging, using your Wirebugs, and attacking, use stamina. When you're at rest, your stamina slowly recharges. Your maximum stamina, represented by the dark red portions of your stamina bar, decreases over the length of your hunt. You can gain it back with a few items.How can I increase my MHR Max Stamina?
Use a Food Item to Restore Stamina When your maximum stamina depletes itself, you can raise it back by eating various food items. A well-done steak will fully restore your stamina, while rations will restore a small amount of stamina.How do you increase your stamina in MHW?
Monster Hunter World: How to Increase Health & StaminaHow to Manage Stamina without Constitution or Stamina Surge | Monster Hunter Rise Guide Tutorial
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Answer 2
You gradually lose stam as you get hungry, you can cook the meat from the herbivores you kill if you have a barbeque though.
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