What are the causes of a sudden drop in Forced Expiratory Volume (FEV)?

Medical Advisory BoardAll articles are reviewed for accuracy by our Medical Advisory Board
Educational purpose only • Exercise caution as content is pending human review
Article Review Status
Submitted
Under Review
Approved

Last updated: May 22, 2025View editorial policy

Personalize

Help us tailor your experience

Which best describes you? Your choice helps us use language that's most understandable for you.

Differential Diagnosis for Fre Sudden Drop

  • Single most likely diagnosis
    • Stroke or Transient Ischemic Attack (TIA): A sudden drop could be indicative of a stroke or TIA, especially if accompanied by other symptoms such as facial drooping, arm weakness, or speech difficulties.
  • Other Likely diagnoses
    • Seizure: A seizure can cause a sudden loss of muscle tone, leading to a drop.
    • Syncope: A fainting spell can also cause a person to drop suddenly, often due to a temporary decrease in blood flow to the brain.
    • Orthostatic Hypotension: A sudden drop in blood pressure upon standing can lead to dizziness and a fall.
  • Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
    • Cardiac Arrest: Although less common, a cardiac arrest can cause a person to drop suddenly, and immediate medical attention is crucial.
    • Subarachnoid Hemorrhage: A sudden, severe headache accompanied by a drop could indicate a subarachnoid hemorrhage, which is a life-threatening condition.
    • Spinal Cord Injury: A sudden drop could potentially cause a spinal cord injury, especially if the person fell from a height or landed awkwardly.
  • Rare diagnoses
    • Drop Attacks: A rare condition characterized by sudden, brief losses of muscle tone, often without loss of consciousness.
    • Cataplexy: A rare neurological disorder that can cause sudden, brief episodes of muscle weakness, often triggered by strong emotions.
    • Vasovagal Syncope: A rare condition that can cause fainting spells, often triggered by specific stimuli such as pain or stress.

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

Have a follow-up question?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.