I have had numbness in my arms and legs and sometimes in my hands and feet what could becausing this?

Neuropathy: Your description may indicate an early peripheral neuropathy, but this can be secondary to some medications, and possibly due to problems in the spinal cord, such as neck, associated with an underlying inflammatory condition. Visit your physician and get this evaluated, as early treatment often turns all of this around.

Lots of possiblities: Numbness could be from diabetes, thyroid disorders, vitamin B12 deficiency, spinal nerves and back problems are some of the more common reasons. I would recommend you work with your doctor and find out the reason. He may send you to a neurologist.

Many things: Back issues like herniated or compressed disc, systemic diseases. This is something that you really should have checked out and not prolong visiting a dcotor. Sometimes, these conditons can be progressive and or worsen the longer you wait to treat.