Why Does My Bra Underwire Dig In?
Underwires are meant to encapsulate and support breast tissue comfortably against your ribcage. If wires poke, pinch, or leave painful marks, your cup dimensions are incorrect.
Quick Answer
Underwires dig in when the cup size is too small or narrow, causing the wire arc to sit on sensitive breast tissue rather than resting flush against the ribcage surrounding the breast root.
Figure 1: Narrow underwire resting on tissue instead of ribcage bonePlausible Causes
1. Wire Arc Width Is Too Narrow
If your cup letter is too small, the semicircular wire is too narrow and will press directly into side breast tissue or underarms.
2. Underbust Band Is Too Tight
An overly tight band stretches the underwires outward flat, altering their curve and forcing wire tips to press inward against your ribs.
Practical Fit Checks
- Wire Placement Check: Trace the wire with your fingers. The wire should encapsulate all breast tissue without touching soft tissue.
- Ribcage Clearance: Ensure the wire rests entirely on bone and rib structure beneath the breast fold (inframammary fold).
Recommended Size Adjustment
Increase your cup letter size to obtain a wider underwire radius:
If 34C underwire pokes side tissue → Try 34D for a wider wire arc
Check Your Baseline Size
Verify underbust and bust measurements to eliminate wire discomfort.