I wish I knew! I had a few minor medical procedures done (wisdom teeth, under anesthesia) and then later on in the year I started getting stomach aches all the

I wish I knew! I had a few minor medical procedures done (wisdom teeth, under anesthesia) and then later on in the year I started getting stomach aches all the time. I don't know if that is just correlation though. I went to a GI doctor later in the year and did the lactose test to confirm it, but I wish I figured it out sooner! The doctor told me that everyone gets more lactose intolerant to an extent as they get older, but I unfortunately have it pretty extreme in my 30's. It does force me to eat healthy whole foods though, as most processed junk foods now make me sick! So overall not so bad. As some other commented, lactose tolerance is more of a spectrum and not a black/white thing. You may be OK with a baked product like cake but not be able to handle a milkshake for example.