1,226 Possible Causes for Lethargy in USA

  • Upper Respiratory Infection

    Sneezing Nasal discharge Runny, red, swollen eyes Coughing Oral and/or nasal ulcers Fever Hoarse voice Drooling Lethargy If your cat has some or many of these symptoms, contact … Keep all of your cats current on vaccinations against respiratory disease If your cat is not recovering or experiences new signs of respiratory disease, lack of appetite, lethargy … Symptoms of feline upper respiratory infections Sniffling, sneezing, clear to pus-like discharge from the eyes and/or nose, coughing and lethargy are common symptoms of an[1] [2]

  • Acute Gastroenteritis
  • Influenza

    Mild, low-grade fever (103 F) Runny nose that may change from clear to thick Lethargy or sleepy demeanor Cough, which may be dry or may bring up sputum Loss of appetite Steve … classical influenza features) and may exhibit a sudden severe collapse (apparent life-threatening episode). [ 4 ] With all influenzas, neonates and infants may present with lethargy … In pigs swine influenza produces fever, lethargy, sneezing, coughing, difficulty breathing and decreased appetite.[3] [4] [5]

  • Appendicitis
  • Skin Infection

    feeling of illness fatigue dizziness lightheadedness muscle aches warm skin sweating Symptoms such as the following could signal that cellulitis is spreading: drowsiness lethargy[6]

  • Meningitis
  • Streptococcal Infection

    Symptoms and Types Some of the common symptoms of this infection include: Pain Fever Arthritis Lethargy Coughing Pneumonia Abscess(es) Difficulty swallowing due to swelling … Symptoms include pale skin, lethargy, loss of appetite, headache, and dull back pain.[7] [8]

  • Lethargy
  • Propionic Acidemia

    methylmalonate and with biotin as a cofactor; caused by a mutation in the gene PCCA encoding propionyl-CoA on 13q or PCCB on 3q; the clinical features are episodic vomiting and lethargy … mi·a ( kē-totik hīpĕr-glī-sēmē-ă ) Inherited metabolic disorder resulting from a deficiency of propionyl-CoA carboxylase PCC; clinical features are episodic vomiting and lethargy … Signs and symptoms appear in infancy and include vomiting, poor feeding, loss of appetite, hypotonia, and lethargy.[9] [10]

  • Overdose


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

Similar symptoms


  1. Feline Upper Respiratory Infection - Connecticut Humane Society, http://www.cthumane.org/site/c.8qLKK1MELjI2F/b.…
  2. Feline Upper Respiratory Infection - The Common Cold, http://www.pethealthnetwork.com/cat-health/cat-…
  3. Influenza, https://en.wikipedia.org/wiki/Influenza
  4. Dog Flu | Canine Influenza, http://www.doginfluenza.com/
  5. Influenza. What is Influenza? Information on the flu, http://patient.info/doctor/influenza
  6. Causes, Symptoms, Treatments, and Pictures, http://www.healthline.com/health/cellulitis
  7. Bacterial Infection (Streptococcus) in Dogs, http://www.petmd.com/dog/conditions/respiratory…
  8. Group A streptococcal infection - Wikipedia, https://en.wikipedia.org/wiki/Group_A_streptoco…
  9. 2017 ICD-10-CM Diagnosis Code E71.121 : Propionic acidemia, http://www.icd10data.com/ICD10CM/Codes/E00-E89/…
  10. Propionic acidemia | definition of Propionic acidemia by Medical dictionary, http://medical-dictionary.thefreedictionary.com…