Adeficiency in vitamin may lead to bleeding problems.

A deficiency in vitamin A may lead to bleeding problems.
vitamin A

I think the answer is:

A deficiency in vitamin K may lead to bleeding problems.

Here's why:

Vitamin K is a blood-clotting vitamin, or a vitamin responsible for blood clots. This basically means that, without vitamins like Vitamin K there, your nose would never stop bleeding and scabs for your scrapes and/or cuts wouldn't form either. Vitamin K deficiency may cause frequent nosebleeds.

Due to Vitamin K being a blood-clotting vitamin that already has a relationship with your blood, I believe a deficiency in vitamin K may lead to bleeding problems, the same way a lack of it can cause nosebleeds often.

Bonus Paragraph About Vitamin K:

Approximately half of the vitamin K you need forms by itself in one's intestinal tract. You can get the rest of the Vitamin K you need (which is around half for this needed vitamin) from cheese, liver, leafy vegetables, asparagus, bacon, green tea, and coffee.

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