Great, but that doesn't rule out spiritual causation and never did. The spiritual effects the physical. That's the testimony of scripture.
Sometimes we have physical problems that we are born with or acquire later. We have to look at more than one thing. Could be spiritual, could be physical.
Stuff happens.
Different case but here is an example of physical stuff not seen.: When I was a kid, i remember hearing on TV about a guy who was shooting at some students from a high tower at the University of Texas--Charles Whitman. 14 people killed there, and before that, he killed his mother and his wife. Sounds like a good candidate for demon possession.Welp Here is what Google says about him:
"Charles Whitman lived a fairly unremarkable life until August 1, 1966, when he murdered 16 people including his wife and mother. ... His autopsy suggests one troubling explanation: Charles Whitman had a brain tumor pressing on his amygdala, a region of the brain crucial for emotion and behavioral control."
Stuff happens.