It could be a new dark wizard. There are always new threats emerging in the fanfiction world. This new dark wizard might have a vendetta against Harry and uses a special spell or potion to make him cough up blood.
Well, it could be related to some sort of poison. Perhaps he was poisoned by an enemy who managed to slip something into his food or drink. The poison could be slowly corroding his insides and making him cough up blood as a symptom. It might also be part of a plot by a new villain in the fanfiction world who is trying to weaken Harry in a more insidious way than the usual dark wizards.
I'm not sure specifically if a fanfic titled 'harry potter harry is burning up' is popular. There are thousands of Harry Potter fanfics out there, and popularity can vary greatly. It would depend on how well - written it is, how unique the plot is, and how it's been promoted within the fan community.
Well, one reason could be that he was poisoned. In the world of Harry Potter, there are many poisonous substances. A fanfic writer might create a scenario where Harry is unknowingly poisoned, and this causes him to throw up blood as his body tries to fight off the toxin. Another possibility is that he has some sort of internal injury from a fight. If he got hit by a powerful spell or a physical attack during a battle, it could lead to internal bleeding which results in throwing up blood.
Well, in the context of a Harry Potter fanfic about blood tests, it could be used to explore a character's heritage more deeply. For example, it might be a way to reveal hidden magical lineages or connections. Maybe it's a plot device to show how a character discovers they have a special blood trait that gives them an edge in magic, like being related to an ancient and powerful wizarding family.
In many fanfics, Basilisk blood is depicted as a very dangerous substance. It's often shown as a thick, greenish - black liquid that hisses and steams when exposed to air, reflecting the Basilisk's own menacing nature.
I'm not entirely sure what 'harry potter throw up fanfic' specifically means. It could potentially be a very strange or poorly written fanfiction related to Harry Potter that makes you feel 'queasy' in a sense, like it's so bad it makes you want to 'throw up'. But it might also be some sort of really out - there creative interpretation that involves a situation in the Harry Potter world where a character throws up or something really odd like that.
Well, 'burning up' can be taken literally or figuratively. Literally, it might be part of a magical accident or spell gone wrong in the fanfic. Figuratively, it could be that Harry is burning with anger, passion, or determination. Since it's a fanfic, the author has the freedom to create scenarios where Harry experiences such intense emotions or situations that are described as 'burning up'.
Often, his friends would rush to his aid. They might try to find a cure or figure out what's wrong with him. Maybe Hermione would start researching in the library right away.