There are many options for repairing wall cracks. It’s relatively easy to hide wall cracks if they are hairline cracks. Minor cracking that is purely cosmetic can be repaired or sealed with filler and paint. There are many reason to cause cracks in the structure for eg. Thermal Movement, Chemical Reaction, Shrinkage, Quantity of Cement, Earthquake, Vegetation, Poor Construction practices, Corrosion Cracks.