Coal, oil and natural gas are three main types of fossil fuels. Fossils fuels are combustible materials that are formed over millions of years by the decomposition of plant and animal life. Continue Reading.
Some of the possible common medical causes of Extremity pain may include: 1  Brachial plexus lesions. 2  Carpel tunnel syndrome. 3  Biceps tendonitis.  Raynauds 1  phenomenon. Sickle cell anemia.  Black widow spider 1  bites. Polyneuropathy.  Cat scratch 1  disease. Post herpetic neuralgia.  Erythema nodosum.
Seller RH, et al. Pain in the lower extremity in adults. In: Differential Diagnosis of Common Complaints. 6th ed. Philadelphia, Pa.: Saunders Elsevier; 2012. Knee and leg. American Academy of Orthopaedic Surgeons. http://orthoinfo.aaos.org/menus/leg.cfm. Accessed Jan. 20, 2016.