Differential Diagnosis for a 20-year-old Male with Fever, Sore Throat, and Diarrhea
- Single most likely diagnosis:
- Viral pharyngitis (e.g., mononucleosis, adenovirus): This is the most likely diagnosis given the acute onset of fever, sore throat, and the presence of diarrhea, which can sometimes accompany viral infections.
- Other Likely diagnoses:
- Bacterial pharyngitis (e.g., streptococcal pharyngitis): Although less common than viral causes, bacterial pharyngitis is a possibility, especially if the sore throat is severe and accompanied by a fever.
- Influenza: Given the symptoms of fever and sore throat, influenza should be considered, especially during flu season.
- Gastroenteritis: The presence of diarrhea could suggest a gastrointestinal infection, which might be related to a viral or bacterial cause.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.):
- Epiglottitis: Although rare, epiglottitis is a life-threatening condition that requires immediate attention. It can present with sore throat, fever, and difficulty swallowing.
- Lemierre's syndrome: This is a rare but serious condition that can follow a throat infection, characterized by fever, sore throat, and neck pain, and can lead to sepsis if not treated promptly.
- Meningitis: While less directly related to the symptoms, meningitis can present with fever and might be considered if there are additional symptoms such as headache or stiff neck.
- Rare diagnoses:
- Toxoplasmosis: This parasitic infection can cause a sore throat and fever, especially in immunocompromised individuals, but it is less common.
- Tularemia: A rare bacterial infection that can cause sore throat, fever, and gastrointestinal symptoms, but it is relatively uncommon and usually associated with specific exposures (e.g., contact with infected animals).
- Yersiniosis: A bacterial infection that can cause fever, sore throat, and gastrointestinal symptoms, but it is not as common as other causes of gastroenteritis.