Internal bleeding occurs when blood leaks from blood vessels inside the body, often due to injury, surgery, or certain medical conditions. This bleeding can happen in various organs, such as the stomach, liver, or lungs, and may not be immediately visible. Symptoms can include pain, swelling, weakness, or dizziness, depending on the location and severity of the bleeding. Diagnosis typically involves imaging tests like CT scans or ultrasounds to identify the source of the bleeding. Treatment may require monitoring, medication, or surgical intervention to stop the bleeding and address any underlying issues. Prompt medical attention is crucial to prevent serious complications.