Hypersensitivity pneumonitis history and symptoms

	Hypersensitivity pneumonitis Microchapters
Home
Patient Information
Overview
Historical Perspective
Classification
Pathophysiology
Causes
Differentiating Hypersensitivity pneumonitis from other Diseases
Epidemiology and Demographics
Risk Factors
Screening
Natural History, Complications & Prognosis
Diagnosis
Diagnostic Criteria
History and Symptoms
Physical Examination
Laboratory Findings
Electrocardiogram
Chest X Ray
CT
MRI
Other Imaging Findings
Other Diagnostic Studies
Treatment
Medical Therapy
Surgery
Primary Prevention
Secondary Prevention
Cost-Effectiveness of Therapy
Future or Investigational Therapies
Hypersensitivity pneumonitis history and symptoms On the Web
Most recent articles
Most cited articles
Review articles
CME Programs
Powerpoint slides
Images
American Roentgen Ray Society Images of Hypersensitivity pneumonitis history and symptoms All Images X-rays Echo & Ultrasound CT Images MRI
Ongoing Trials at Clinical Trials.gov
US National Guidelines Clearinghouse
NICE Guidance
FDA on Hypersensitivity pneumonitis history and symptoms
CDC on Hypersensitivity pneumonitis history and symptoms
Hypersensitivity pneumonitis history and symptoms in the news
Blogs on Hypersensitivity pneumonitis history and symptoms
Directions to Hospitals Treating Hypersensitivity pneumonitis
Risk calculators and risk factors for Hypersensitivity pneumonitis history and symptoms

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1];Associate Editor(s)-in-Chief: Sargun Singh Walia M.B.B.S.[2]

Overview

According to duration of illness, the clinical presentation of Hypersentivity Pneumonitis is categorized as acute, subacute, or chronic.

Patients with HP present with positive history based on the acute, subacute, or chronic status:

Acute HP^[1]
- Flulike syndrome
  - Fever, malaise, chills, dyspnea , headache , chest tightness, and cough.
- Significantly exposure leads to development of HP within hours.
- Symptoms gradually resolve after removal of exposure.
- Re-exposure leads to recurrence of symptoms.
Subacute hypersensitivity pneumonitis^[2]
- Insidious in onset.
- Symptoms present over weeks to months.
- Symptoms include dyspnea, cough, and fatigue.
- Patients may present with anorexia and weight loss.
Chronic hypersensitivity pneumonitis
- Insidious in onset.
- Patients may be undiagnosed with untreated subacute disease.
- Patients may present with cough, malaise, dyspnea, and weight loss.
- Removing exposure results in only partial improvement.^[3]

↑ Agostini C, Trentin L, Facco M, Semenzato G (September 2004). "New aspects of hypersensitivity pneumonitis". Curr Opin Pulm Med. 10 (5): 378–82. PMID 15316436.
↑ Schlueter DP (September 1974). "Response of the lung to inhaled antigens". Am. J. Med. 57 (3): 476–92. PMID 4607028.
↑ Tsutsui T, Miyazaki Y, Okamoto T, Tateishi T, Furusawa H, Tsuchiya K, Fujie T, Tamaoka M, Sakashita H, Sumi Y, Inase N (September 2015). "Antigen avoidance tests for diagnosis of chronic hypersensitivity pneumonitis". Respir Investig. 53 (5): 217–24. doi:10.1016/j.resinv.2015.04.003. PMID 26344611.