Hello and welcome to HCM
Presence of white flakes in urine is of concern.
You need to get an urine examin ation- routine examination and microscopy.
White flakes indicates either a fungal infection
or presence of proteins
Cramps can be due to the cramping of muscles of uterus
As you have mentioned that your wife is in peri-menopausal age group, then this kind of cramping can happen in the absence of bleeding.
During peri-menopausal phase ovulation starts ceasing slowly with decrease in bleeding.
You can take an anti-spasmodic for relief.
Consult your doctor for white flakes in urine.
Thanks and take care
Dr Shailja P Wahal