Osteomyelitis is an infection of the bone, often caused by bacteria. It can occur after an injury, surgery, or due to the spread of infection from nearby tissues. Symptoms may include pain, swelling, fever, and redness over the affected area. Treatment typically involves antibiotics to fight the infection, and in some cases, surgery may be necessary to remove infected tissue. Early diagnosis and treatment are crucial to prevent complications, such as bone damage or chronic infection.