I tend to find any phantom pain I’ve had wasn’t apparent as soon as I wake up because I’ve not had time yet to put it there. The pain from my lump didn’t come and go at all. It was always there and got progressively worse over time.
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Same here - clear after June 24 mammogram then Oct 25 pleomorphic invasive lobular 3.6cm and 2 lymph nodes - obviously missed year before 
I had a shooting pain from my breast to under my arm - Looking back it was from tumour to positive lymph nodes.
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I am the same as @mssteel … my lump when diagnosed was 3.2cm x 2.2cm in January, treatment started at the beginning of March and the pain had got worse and worse to that point, almost constant … my lump felt as if it had grown as well, but then I’m TN and Triple Negative is super fast growing (I had my first mammogram exactly 1-year before finding the lump of which was clear, so this lump had grown to that size in less than a year) … once I started treatment, within a couple of weeks, the pain has subsided 
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Great to hear that the pain has subsided @big. 
Mine has too, although interestingly it never occurred to me it had gone until the ultrasound to insert my clip showed surprise tumour shrinkage between my single dose of EC and starting my new chemo regime. Like phantom pain in reverse!
Back on the thread’s subject of tumour size, my original tumour was confirmed at 10.5mm after surgery and had previously shown up on ultrasound at 11mm and 12mm on mammogram. My local recurrence showed up on ultrasound as three tumours, but I didn’t get the measurements as it was thought to be just fat necrosis until the biopsy confirmed otherwise.
A subsequent mammogram of the recurrence showed two tumours at 16mm and 14mm but the third, which was much smaller, didn’t show up. My MRI clearly showed all three tumours totalling 36mm so I’m assuming the smaller one was 6mm, which is consistent with how it felt on manual examination.