Sore shoulders from your bra
Short answer: Marks and soreness in the shoulders usually mean the straps are carrying too much. The answer is a firmer band and wider straps, not tighter straps.
The straps should not carry
The underband should take most of the weight. The straps only hold the cup in place.
Marks in the evening
If there are clear marks in the shoulders when you take the bra off, the straps are carrying too much.
Wider straps
Wide straps spread the weight over a larger area. See bra for a large bust with wide straps.
A firmer band
A band that sits firmly moves the weight away from the shoulders. See how to find your bra size at home.
Without underwire
A soft wire-free model spreads the pressure differently and is used by many people for exactly that reason. See bamboo bra without underwire.
Replace in time
A bra with worn elastic gives sore shoulders, because the band no longer holds. See when should a bra be replaced.
Washing
A laundry bag at 40 degrees extends the life. See the washing guide.
Frequently asked questions
Why do I get marks in my shoulders?
Because the straps are carrying too much of the weight.
Should I tighten the straps less?
Yes, and at the same time make sure the band sits firmly.
Do wide straps help?
Yes. They spread the weight over a larger area.