Acute osteomyelitis is a sudden and severe infection of the bone, often caused by bacteria. It can occur after an injury, surgery, or through the bloodstream. Symptoms typically include pain in the affected area, fever, and swelling. Diagnosis usually involves imaging tests like X-rays or MRI, along with blood tests to identify the infection. Treatment often requires antibiotics and, in some cases, surgery to remove infected tissue. Early intervention is crucial to prevent complications and promote healing.