All helpful thanks. With me it's not limited to cycling and any activity even like DIY which requires me to compromise my upper back causes it to flare up eventually. I did muck around with bike sizing and went for a smaller frame, short drop bars etc not much difference. With me I sometimes get an accompanying patch of numbness/reduced sensitivity over the affected area but that's more of a winter thing oddly. I reckon it's nerve impingement and a phantom pain from misfiring nerves. When the NHS is up and running again I might look to see if I can get nerve blockers.
