Hey there, numbness and or tingling should make you think of nervous tissue. What kinds of things cause neevous tissue damage or insult? CVA- usually facial or one sided sensory loss or tingling. Diabetes- lower extremity nerve damage due to decreased small vessel blood supply to the nerves. Ortho/musculoskeletal- nerve impingement, myofascial swelling, compartment syndrome or direct nerve trauma. These are some things to think of, but always take numbness and swelling as a sign of a nerve issue. I use UpToDate for most of my info nowdays. From patho and treatments to prescribing and referrals. Be careful, you can waste a great deal of time on there.