Does drinking mainstream, mass-produced lagers give you a worse hangover than real ale? I have noticed that when I spend a night drinking the usual lagers found on bar taps in the UK (Heineken, Carlsberg, etc.), I have a much worse hangover than when I spend a night drinking locally brewed real ales (or mass-produced real ales such as Spitfire, Wainwright, etc.).

Is there any reason for this? Do lagers contain any ingredients that can cause worse hangovers than real ales?
That is possible to a level, but not proven, and probably does not make a huge difference, as there are many factors causing hangover, some stronger than others. 

Moreover, that would be saying that all commercial beers have the same effects and all local brewed ales have the same other (better) effect, which sounds to me very simple and convenient to conclude.

That being said, adjuncts in mass-produced beers may still play a role, but I would tend to seek the explanation for the hangover difference in context first.

But anyway, hangover mechanisms are not well understood, so I could be wrong !