I did not see you had a return reponse....
Well it can hurt too on one side - and that could be due to an infection
That could also be due to hormones
So hence these are all things that definitely need to be checked.
But if she is in pain - she can take ibuprofen, paracetamol;
She can also use over the counter things too for sweats such as vitex, chasteberry, dong quai and black cohosh.
I wish your mother well
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that would be fair