system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: The differences between aspirin, ibuprofen, and acetaminophen

as far as I know these are all completely interchangeable when dealing with aches and pains (especially headaches)

But how do each of these drugs work, and is one better than the other depending on underlying problem?
gpt
aspirin: blood thinner. this is why it's effective for heart disease.

ibuprofin: anti-inflammatory. that's why it's effective for swollen things.

tylenol: general pain killer. that's why it's better for generic/non-specific pain.

that's about as simple as i can make it.