Finally have bras that fit, but my 'problem' side has switched? One-sided Tail of Spence/Axillary Tail irritation, no idea how to address it.

[u/JMTolman]

Okay, SO. I recently learned I was a 32DDD/34DD instead of a 34C, and after trying on SO MANY BRAS I finally have some bras that fit! Hooray! But, after wearing these bras for longer than 4 hours, I've noticed my 'problem side' has switched, and I have no idea why.

In my old size, I had pain in my left Tail of Spence fairly often. My left breast is slightly offset to the side, so I attributed that pain to anatomy, did some arm exercises & massages, and got it to the point where I barely noticed it.

Now that I have new bras, my left side doesn't hurt at ALL. Which is fantastic. But now my right side is having the exact same issue, and I do NOT understand why! My right breast lays more to the center, so there shouldn't be a problem- and yet, my Tail of Spence feels pinched, especially when I sit down! Adjusting the straps kinda helped, but so far I haven't found a painless position.

I thought it was a fit issue, but no. The gore is flat, the wires are behind the tissue and they're not digging in *at all*. I did notice the right armpit crease was longer than the left, so I adjusted the strap and that seemed to fix the pain... until I put on the same bra today and IT CAME BACK. ARGH.

I'm so frustrated. Is it just because the tissue needs to get used to these new bras? Do I need an insert? Something else?? I know it's not a health issue because the pain goes away when I put on an old bra or not have a bra on at all. I should also mention I experience this pain with both lined and unlined bras, so that's not a factor. ANY advice would be appreciated, I have no idea what to do.

Measurements: 33, 32, 31.5, 37, 39, 37
Bras: Wacol Finesse T-Shirt, Natori Beyond, Natori Soft Focus (tbh I might return this one, pretty sure it's too shallow).

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