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Heavier Gauge Strings Warping Neck?

Hey all, I just switched my gauge of strings from 45-105 to 55-115 for tuning changing in different band settings. So my concern is that I did a check of my neck straightness by just looking from bridge to headstock, and it is a little warped. I gig a lot and it gets pretty sweaty so I guess my question would be is this from the strings, or could it just be from use? Keep in mind I have not had any kind of tune-up on it for about 6 months. Any information would be appreciated!
 
While we're here, a little lesson in nomenclature. What you see on your neck is not a warp (twist). What you see is "fore bow" or "relief". Now as others have said, the heavier strings are at higher tension to reach pitch and will consequently increase bow in the neck. The truss rod needs an adjustment to compensate. Take it to a good tech, luthier, or learn how to set up a bass. Have fun.