The reason could be because of an accident. Most likely, water/liquid spills. Do you remember anything like this happening before? It could also be because of dropping it, quite hard, even if there doesn't seem to be any obvious damage such as cracks, freezing, resetting, etc.
A ribbon cable could have also come loose, and if so, you should visit an apple store as soon as you can, because this could be dangerous! This can mess up the colours a bit, making random shapes (such as lines) appear on your screen.
I would recommend simply visiting your local apple store for a repair.
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