In simple words: Dengue hemorrhagic fever is a serious form of dengue. It causes high fever, headaches, body aches, rash, and sometimes dangerous bleeding and low blood pressure. It is spread by mosquitoes. Treatment involves rest, fluids, and medications to reduce fever and pain.

Dengue hemorrhagic fever (DHF) is a severe manifestation of dengue fever caused by any of the four dengue virus serotypes. It is characterized by high fever, headache, muscle and joint pain, rash, and potentially life-threatening complications like bleeding (gastrointestinal, under the skin, hematuria), low platelet count, plasma leakage, and dangerously low blood pressure. DHF can progress to dengue shock syndrome (DSS), marked by shock, internal bleeding, organ failure, and potentially death.Diagnosis involves physical examination, assessment of symptoms, and laboratory tests like complete blood count (CBC), prothrombin time, activated partial thromboplastin time, fibrinogen levels, and specific tests like PCR and ELISA. Treatment focuses on managing symptoms with rest, fluids, antipyretics, and pain relievers.

Example 1: A patient presents with high fever, severe headache, muscle and joint pain, and a rash after recent travel to a tropical region. Blood tests reveal low platelet count and evidence of dengue virus infection, confirming DHF., A child experiences a sudden high fever, abdominal pain, persistent vomiting, and bleeding gums. These symptoms, coupled with a recent history of dengue fever, lead to a diagnosis of DHF., A patient initially diagnosed with dengue fever develops worsening symptoms, including difficulty breathing, severe stomach pain, and blood in the stool, indicating progression to DHF.

Documentation should include travel history, symptoms (fever, headache, pain, rash, bleeding), physical exam findings (evidence of plasma leakage, bleeding), laboratory results (CBC, coagulation tests, PCR, ELISA), and treatment provided.