In the early stage of rheumatic fever, most patients show signs of infection, such as pharyngitis or tonsillitis. Patients with rheumatic fever often also experience fever, with body temperatures generally ranging from 38 to 40°C. Additionally, there may be migrating arthritis characterized by redness, swelling, warmth, pain, and limited mobility in the joints. Rheumatic fever patients may also suffer from cardiac valve lesions, primarily manifesting as valvulitis, myocarditis, or pericarditis, with damage to the valves being most common. Skin rashes, mainly presenting as ring-shaped erythema or subcutaneous nodules, can also occur. Some patients with rheumatic fever may experience chorea, which are among the primary symptoms of the condition.