I'm 8 weeks out from band to RNY, for about a month now I've been getting headaches. Does anyone know why this may be? I never had headaches ever before surgery. Also some Water retention?

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Ur not drinking enough water, maybe.

There might be a connection. One condition that may cause it is called spontaneous intracranial hypotension.

http://www.webmd.com/diet/obesity/20141022/weight-loss-surgery-may-raise-risk-of-severe-headaches-scientists-report

https://www.aan.com/pressroom/home/pressrelease/1314

You might search the internet for more links.

Funny you bring this up; I am 8 weeks post op from RNY and last couple of days getting headaches. Of course the cottonwood is flying where I live, and I know I'm allergic. Eyes are watering and itchy, nose is drippy, a little bit of a cough, and sneezing. So the headache could just be from my allergies, but I have also had some Water rentention as well this past week. I guess I better up the Fluid intake. I was a bit concerned that I might not be meeting my 64 oz minimum lately.