Most recommendations for MP patients include "try to lose weight".

One can get this from abdominal surgery (which is how I got mine). Some people have reported MP from bone graft harvest of the pelvic bone.

Tight clothing, tight belts, even males who carry their wallets in their back pockets have been suggested. Tight blue jeans, especially.

I use Lidoderm patches for mine. After 14 straight days of use, my MP of many years quieted down alot. The only thing that sets it off now is extreme stretching (too much exercise) or hot baths or steam baths (it will start up after 10 minutes in a steam room!). I place the patch, cut in half, at the top of the thigh, where the nerve exits the groin. Also I have placed it on the lateral top of the thigh as well.

My MP started after a C-section (surgery).

Here is an article about it:
http://www.aafp.org/afp/20000401/2109.html

Figure 2b...shows the placement of the nerve. It can help you place the Lidoderm patch if you choose to try that. Place the patch at the point where that ligament is above the nerve. You can see how tight clothing will compress that area as well.