Influenza is classified as type A, type B or type C. Type A is the most severe and is responsible for epidemics such as avian flu and swine flu. The signs and symptoms of type A influenza can affect the digestive system, muscles, respiratory system and the body as a whole.
Extreme Fatigue
Influenza causes fatigue and weakness and makes it difficult to carry out daily activities. Anyone with the flu should stay home from work or school and avoid social activities in order to rest so that the body can better fight the infection.
Fever
Fever is one of the most common signs of type A influenza. The fever that accompanies this type of flu is usually high and comes on suddenly. The University of Maryland Medical Center defines a high fever as a temperature of 104 degrees or above, but the Mayo Clinic indicates that a fever of 101 degrees or above may be a sign of the flu.
Headache
Type A influenza is often accompanied by a headache. According to the Nemours Foundation, this flu symptom may appear 1 to 4 days after a person has been exposed to type A influenza. This headache may continue for the duration of the flu.
Respiratory Symptoms
The respiratory system is greatly affected by type A influenza. The most common respiratory symptoms are dry cough, runny nose, stuffy nose and sore throat. These symptoms may make it difficult to breath. Over-the-counter cough medicines and decongestants can be used to treat these symptoms. If they persist, prescription medications may be recommended by a physician.
Digestive Symptoms
The digestive system is also affected by the type A influenza virus. Nausea and vomiting may occur frequently at the onset of the flu. This puts a flu victim at risk for dehydration, so it is important to drink as much fluid as can be tolerated. Influenza can also cause a loss of appetite that will subside after the virus has run its course.
Muscle Aches
Muscle aches are often reported by people who have the type A influenza virus. These aches are caused by water loss in the muscle cells. High fevers cause greater use of the water contained in these cells, and the vomiting and diarrhea that accompany influenza also lead to fluid loss. Heating pads or hot water bottles may be used to ease muscles aches caused by type A influenza.
