Water veins underground causing health problems It seems to be given that around my country everybody believes in water veins (that's the best that Google Translate could come up with. Basically underground water currents) that somehow affect humans. For example, one of the beliefs is that if you put your bed over one of these water veins and sleep on it, you'll start getting heart problems within in a couple of years. 

Since I'm slightly more skeptic, I tried googling around, but all I found was some weird new age websites. So I'm asking the specialists. Is this underground water veins health effect thing real?
In my opinion, there is no such thing as water veins as described in this article, but, it is a fact that there is water circulation underground.

In the natural environment, water can either circulate in porous mediums (like within the small spaces between sand grains in sandy soils) or as underground streams. There is also the concept of the water table and aquifer recharge and depletion.

This schematic provides a broad picture on the importance of groundwater



More info here as well.

Some regions composed of rocks, especially carbonates (karst) can have more often channelized underground streams, as the ground is not necessarily porous so water is kind of forced to flow where there is an opening (see following figure). (More info on karstic landscape here)



So that was a small overview on how water can circulate underground.

Then people getting sick from water circulating underground is not because of the veins per se, it could be because of moisture (or many other factors). But then living near a lake or any streams, any wet areas or in a badly insulated house could make people sick as well.

This is 'old wives' tale' (no offense - English is not my primary language I am not sure how to say) and is not really a thing as presented in the http://swissharmony.com/en/water-veins-neutralized site. There has been no new research in a medical paper about geopathy since 1940 (wonder why?). You are doing well in being skeptical! To conclude I am sure many people living in drylands would be more than happy to be  'sick' over a vein.