I think this is a very good question...one we ALL ask as we begin to learn...if only from curiosity.
I don't know the answers...wish I did.
But, I do know this...
I've had a recurring sort of a small headache, for years. It runs in a line from behind my right eyebrow, up over my head, to a spot high on the back of my scalp.
At one time I had sharp shooting pains severe enough to send me to Emergency asking questions.
They gave me a CAT scan, and pronounced it as 'nothing', which was okay by me because the sharp pangs stopped and haven't returned.
But my doctor was some annoyed when she recieved the report. She thinks that CAT scans have side-effects, and she stated that she certainly wouldn't order one for me! (My age? 70, going on 32. Grin.)
Four rounds of Humaworm didn't harm me in any way...in fact, all signs of the headache are gone, at last!
I am only guessing, but I think they could have come from slow bowel problems...for years.
The now gone headache could signal that the bowel condition has improved.
Come to think of it, the headache disappeared entirely around the time I was trying HumaCleanse!
Other things that could have caused those headaches were several sharp blows on the head, and eyebrow, I have received over the years. One, from when I was two, caused me to have a stitch taken, about 1/2 inch from where the headaches eventually began.
(For your amusement...the doctor came to our house, and used the kitchen table to perform the 'operation'. That's just how things were in 1940...bless those doctors. We couldn't have afforded more, anyway.)
Probably it is a good idea NOT to worry too much...and ask questions of experts.