The inside of my thigh is numb, what is the cause and solution?

The nerve that governs the movement and sensation of inner thigh is the obturator nerve.
If this obturator nerve does not function properly, it can cause abnormal feeling in the inner thigh.

There are two specific causes.

1) The problem of iliopsoas muscle

-The obturator nerve is derived from lumbar plexus.

This lumbar plexus can be entrapped by the iliopsoas muscle and it can cause an abnormal feeling on the inner thigh.

2) The problem of the obturator muscle that wraps the obturator foramen.
-Obturator nerve pass through the obturator foramen and there is the obturator muscle near the obturator foramen. If the obturator muscle entrap the obturator nerve, it can cause the same problem.

Then how can we solve this problem?

1) Stretching

-Stretching can loosen the obturator muscle with muscle abductor as shown in this picture.

2) Exercise

If the adductor muscle is weakened, the obturator nerve also doensn't function well. Inner thigh exercise can make the obturator nerve fuction well.