Possible Causes for Lethargy in USA

  • Upper Respiratory Infection

    Upper respiratory infections include the components of the upper airway and are most commonly caused by viruses. The onset of symptoms occurs 2 to 3 days after exposure to the infectious agent. The illness usually lasts for 7 to 10 days. Nasal congestion, sneezing and sore throat are the hallmarks of the…[1]

  • Acute Gastroenteritis

    Acute gastroenteritis refers to an inflammation of stomach and intestines mainly caused by infection with viral or bacterial agents. Sudden onset of symptoms like abdominal pain, vomiting and diarrhea is characteristic for this condition. AG may run an asymptomatic, typical or severe course, depending on the overall…[2]

  • Appendicitis

    Appendicitis is an inflammation of the vermiform appendix. The typical symptoms include periumbilical pain, vomiting and nausea followed by fever and right lower quadrant abdominal pain. Classic presentation of acute appendicitis begins with pains, with vomiting setting in and fever coming in lastly. The appendix’s…[3]

  • Meningitis

    Meningitis is an inflammation of the meninges. The most common causes in adults are bacterial infections with Streptococcus pneumoniae, Neisseria meningitidis or Haemophilus influenzae. Aseptic meningitis may be caused by drugs (eg. NSAIDs, metronidazole and IV immunoglobulin), neoplasms or viruses. Typical signs and…[4]

  • VIPoma

    Additional symptoms include nausea, vomiting, abdominal pain, bloating, weakness, and lethargy. … Other symptoms that are reported include flushing (which is one of the main features of carcinoid syndrome), weight loss, lethargy, abdominal pain and bloating. … hypokalemia and achlorhydria (known as WDHA syndrome or pancreatic cholera) can be observed in virtually all patients and manifests as severe dehydration, weakness, and lethargy[5]

  • Ornithine Transcarbamylase Deficiency

    The worst affected patients are hemizygous males, in whom a neonatal onset of hyperammonemia is manifested by poor feeding, vomiting, lethargy, tachypnea, and irritability … [6]

  • Bilirubin Encephalopathy

    Jaundice as the most prominent finding, together with lethargy, feeding difficulties, and hypotonia followed by hypertonia are some of the earliest symptoms seen in acute … [7]

  • Methylmalonic Acidemia

    Typical episodic features include vomiting, dehydration, lethargy, failure to thrive, hypotonia, seizures, and even coma. … Physical exam Remarkable findings on the physical exam may include hepatomegaly, lethargy, floppiness, dehydration, and failure to thrive. … These features include: Vomiting Dehydration Lethargy Seizures Poor muscle tone Stroke Trouble with breathing Repeated episodes of yeast infections Coma Developmental delay … [8]

  • Insulinoma

    Neuroglycopenic symtoms oberserved in patients are headache, confusion, lethargy, diplopia, blurred vision, amnesia, seizures and in more severe cases unconsciousness. … Symptoms include double vision, blurred vision, headache, lethargy, confusion, weakness, sweating, hunger, tremors, tremulousness, anxiety, rapid heart rate and in severe … [9]

  • Hepatic Encephalopathy

    personality changes usually accompanied by inappropriate behavior and slurred speech; heavily reduced mental task performance; recurrent/intermittent time disorientation; frequent lethargy[10]


Lethargy is a lowered level of consciousness characterized by drowsiness and apathy.

Further symptoms

Similar symptoms


  1. Upper Respiratory Infection, Symptoma
  2. Acute Gastroenteritis, Symptoma
  3. Appendicitis, Symptoma
  4. Meningitis, Symptoma
  5. VIPoma, Symptoma
  6. Ornithine Transcarbamylase Deficiency, Symptoma
  7. Bilirubin Encephalopathy, Symptoma
  8. Methylmalonic Acidemia, Symptoma
  9. Insulinoma, Symptoma
  10. Hepatic Encephalopathy, Symptoma