Carpal Tunnel Syndrome
may be the culprit. There is excessive fluid storage in body because of hormonal changes of menstruation
. There is pressure on the nerves / blood vessels passing below the wrist band through the carpal tunnel.
You may check your weight, decrease if overweight.
Check your Thyroid for hypothyroidism
with Serum TSH blood test
. Hypothyroidism is very common in females and leads to Carpal Tunnel Syndrome.