Dear Harry Potter Fanfic author...

I'm so glad Snape has seen the real Harry during those harrowing Legilimency lessons. Good to know that Harry will get help for those headaches. Pesky things, headaches.

Yep, no wonder he has those, what with that ruptured spleen of his.

Gadzooks! You're right, if that ruptured spleen had gone undiscovered much longer, well, it would not have been pretty. 

Let's recap, shall we?

Harry and Snape started working on Legilimency after Christmas of Harry's Fifth Year at Hogwarts. He has not seen Uncle Vernon, Aunt Petunia or darling Cousin Dudders since 1 September at the latest. So who caused the splenic fracture? My God, just what kind of school is Dumbledore running? Or had he already skedaddled, I don't remember. Dumbledore, Umbridge, I get them confused sometimes. Never mind that now.

But you know...with a little tweaking, we might make this work for you. How about this, Harry has an excess of yellow bile, okay, he's splenic. It works, don't you see, a choleric Harry is a caplocks Harry. And we hardly ever see the hard sciences at Hogwarts. Bringing in the elements and humours and hell the doctrine of signatures would really ground the whole Potterverse, make it more real. You just can't argue with true facts. 

Now go away, you make my head hurt and I'm prettty sure it's not because of my spleen. I'm more the black bile sort, myself.