What is the cause of stabbing pain in the inner thigh?

See a Doctor or Emergency Room; it could a serious condition like Deep vein thrombosis or blood clot. If you have cold areas or numbness you have a chance of a blood clot.

Or could just be a muscle pull in that area but you won’t know until you get it checked out.

Or a pinched nerve.

Take two ibuprofen.

Please get it checked out. Please stop trawling the internet asking questions and tell someone who can actually help! Do you have access to medical care?