usually this type of sensation is caused by a nerve malfunction -- either compression of the nerve root at the spine or some other localized nerve irritation. if you're having this sensation frequently it's worth getting checked out by a medical professional. with a physical exam and perhaps some additional testing (like an mri) your health care provider can determine if this sensation is caused by something like degenerative disc disease in your lower spine. a condition like that may need to be monitored as it will only get worse over time. i should note also that other conditions could cause the type of sensation you're describing which is why it would be a good idea to have this evaluated if it's happening frequently. if this sensation only occurs occasionally you probably don't need to be concerned. minor nerve irritation causing symptoms happens to all of us from time to time. i hope this helps!
why is it that i get a warm water sensantion in my leg? its in the same area every time. at first i thought i had unrinated on myself but that was not the case.