Leg pain can be mild or severe. It can be caused by leg problems as well as spine, blood, blood vessel or nerve problems etc. The causes of leg pain in adults are somewhat different from that causing leg pain in children. Trauma and sport injury is more common in children. Limp is most often caused by leg pain. For leg pain in adults, use Leg pain in adults instead.
By answering questions about your condition, you can find the causes.