Mind maps: turn 20 diseases into 4 buckets
When a topic feels like a memorization wall, the fix is not more flashcards. It is the right organizing axis — the one that collapses twenty diseases into a handful of mechanism buckets you can actually hold in working memory under test pressure.
The problem with disease lists
Open any review book to a high-yield topic and you will find a list. Twenty diseases, sometimes more, each with their own demographics, labs, and management. The implicit study instruction is: memorize all of these, and on test day, recognize which one the stem is describing.
That instruction does not work. Not because you cannot memorize twenty things — you can — but because under timed pressure you cannot run a twenty-way comparison in your head. You need one sorting question that gets you to a bucket of three to five. After that, the specifics are tractable.
The bucket is the work. The diseases inside the bucket are the easy part.
This morning’s example: platelets
I sat down with thrombocytopenia and bleeding disorders this morning and asked the only question that matters: what are the mechanisms? Every disease in this space exists for one of four reasons. So I made four buckets, and then sorted every testable disease into exactly one of them.
- Microangiopathic. Platelets are getting destroyed in the vasculature itself. Schistocytes on the smear. TTP, HUS, DIC, HELLP, HIT.
- Platelet dysfunction (qualitative). The count may be normal, but the platelets do not work. von Willebrand disease, uremic platelet dysfunction, aspirin/NSAIDs, Glanzmann thrombasthenia, Bernard-Soulier.
- Production. The bone marrow is not making them. Aplastic anemia, acute leukemia, marrow infiltration, B12/folate deficiency, chemotherapy and radiation.
- Sequestration / dilution. The platelets exist but are not where they are needed. Cirrhosis with splenomegaly, massive transfusion.
Twenty-plus diseases, four drawers. Every disease lives in exactly one drawer. If a disease seems to want two drawers, the drawers are wrong — or you are remembering the disease wrong.
The buckets are the test. The diseases are the easy part.
What this changes on test day
Now I do not approach a thrombocytopenia stem by running through twenty diagnoses. I ask one question first: which drawer is this?
The drawer question is short and almost always answerable from the stem alone. Schistocytes on the smear? Microangiopathic. Bleeding with a normal platelet count? Dysfunction. Pancytopenia with a hypocellular marrow? Production. Massive spleen, cirrhosis, recent trauma with transfusion? Sequestration or dilution.
One yes-or-no answer cuts the field by roughly five-to-one before you have looked at a single disease-specific detail. Now you are choosing between three to five conditions inside a single drawer, and that is a comparison your brain can run in real time. That is where the disease-specific equations live — the ones we talked about in the last post.
How to build one for any topic
The platelet map is not special. The method is.
Three steps. First, dump every testable disease for the topic onto a single page — the whole list, no organization. Second, ask what mechanism buckets cover all of them with minimal overlap. Almost every Step 2 and Step 3 topic resolves to three to five buckets. If you find yourself with eight, you are slicing the wrong axis. Try again. Third, sort every disease into exactly one bucket. If a disease wants to live in two, your buckets are wrong — rebuild them until each disease has one home.
The output is a single page. Four headers, a handful of diseases under each. That is the whole map. It looks too small to be useful, which is exactly why it works.
The test is not asking you to recall twenty diseases. It is asking you to sort one stem into one drawer. Build the drawers, and the rest gets quiet.
Want help finding the right organizing axis for the topics that are not sticking? The free 15-minute intro call is a read on which topics are eating your score and what bucket structure would unstick them fastest. Book the call →