Rheumatic fever and scarlet fever

Scarlet fever usually begins with a throat infection and may cause fever, sore throat, swollen glands, and a rough-feeling rash. Rheumatic fever happens later in some people after a group A streptococcal infection and reflects inflammation in the body. It can involve joints, skin, the nervous system, and the heart valves. Having scarlet fever does not mean that rheumatic fever will develop, and a rash or fever can have other explanations.

The useful connection is practical: a suspected streptococcal illness should be assessed, because appropriate treatment can reduce the chance of the infection continuing and causing later problems. The conditions should not be diagnosed from the rash alone.

Contact a clinician if a child or adult has a sore throat with fever, swollen neck glands, or a sandpaper-like rash. The clinician may examine the throat and decide whether testing or antibiotic treatment is appropriate. Give prescribed medicine exactly as directed and avoid sharing antibiotics. Keep the person comfortable with fluids and rest, and follow local advice about returning to school or work while the throat infection may still spread.

Seek urgent help for difficulty breathing or swallowing, drooling, marked sleepiness, dehydration, chest pain, fainting, or a new irregular heartbeat. Arrange prompt review if joint pain and swelling, unusual movements, or breathlessness appear after scarlet fever or another suspected streptococcal infection. Fever that is persistent or worsening also deserves clinical assessment.

Ask whether the illness looks like scarlet fever or another cause of sore throat and rash, whether a throat test is needed, and how to take any antibiotic treatment. If symptoms continue after recovery, ask whether the heart, joints, or movement need checking and when follow-up should happen.