No. Thin vertical or random hairline cracks are usually cosmetic shrinkage and not structural. Horizontal cracks in a block wall, stair-step cracks, wide or growing cracks, and cracks that leak water are the ones that signal a structural problem worth evaluating.
More detail
Concrete cracks for several reasons and only some of them are structural. Cosmetic cracks are typically hairline (narrower than about 1/8 inch), run vertically or in random patterns, do not grow over time, and often come from normal concrete shrinkage and curing in the first year or from minor settling. These usually need nothing, or at most a cosmetic seal. The cracks that warrant a structural evaluation are: horizontal cracks across a block or poured wall (a classic sign of lateral pressure bowing the wall in), stair-step cracks following the mortar joints in block or brick (a sign of differential settlement or lateral movement), wide cracks (wider than about 1/4 inch), cracks that are visibly growing when you mark and date them, cracks that are wider at one end than the other, and any crack actively leaking water, which both signals a path through the wall and accelerates further deterioration. Diagonal cracks radiating from the corners of windows and doors point to settlement. A practical first step for a questionable crack is to mark each end with a dated pencil line, or install an inexpensive crack-monitor gauge, and watch it for a few weeks to a couple of months; a crack that does not move is far less urgent than one that does. For anything in the structural-warning category, we bring in a licensed engineer to determine the cause, because the repair for a leaking shrinkage crack (epoxy or polyurethane injection) is completely different from the repair for a wall failing under soil pressure (stabilization plus drainage).