6 Alarming Causes Of Leg Pain

2. Septic Arthritis

Infants and older adults are susceptible to septic arthritis. If you have sudden onset of knee, hip, or shoulder pain and a fever after an infection or if you get a penetrating injury to the joint, see your doctor. The germs from the infection may have traveled to a joint and set up shop. The infection occurs quickly and damages cartilage and bone.

Risk factors include existing joint problems, certain medications, fragile skin, a weakened immune system and joint trauma.

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