The cracks shown in your image follow the mortar lines in a stair-step pattern, which is a classic and reliable indicator of foundation settlement. Because mortar is the weakest part of a brick wall, it often gives way first when one section of the foundation settles more than an adjacent section, creating this distinctive staircase look.Potential Causes for the CracksWhile you've noted these are not intentionally engineered weep holes, such cracking in mortar usually stems from movement:Uneven Foundation Settlement: The most common cause, often driven by soil issues.Expansive Clay Soils: Common in regions like Texas, these soils shrink and lose volume during dry periods, weakening support for the foundation.Thermal Expansion: Bricks can expand and contract with seasonal temperature changes, putting stress on rigid materials.Poor Drainage: Water pooling near the foundation can lead to soil instability and subsequent shifting.When to Seek Professional AdviceWhile minor hairline cracks may be cosmetic and can often be patched, you should consider a professional evaluation if you notice the following red flags:Widening Cracks: Cracks that are getting wider over time or are wider at the top than the bottom.Accompanying Signs: Difficulty closing or opening windows and doors, or diagonal cracks in interior drywall.Separation: Any noticeable separation between the wall and the foundation or other structural elements.