Post viral fatigue syndromes (PVFS) refer to a group of debilitating medical conditions that are characterized by extreme and prolonged fatigue following a viral infection. The term encompasses a range of conditions such as chronic fatigue syndrome (CFS), myalgic encephalomyelitis (ME), or post infectious fatigue syndrome (PIFS). PVFS typically occurs after a viral infection, such as influenza, mononucleosis, or glandular fever, but can also follow other viral illnesses.
PVFS is characterized by persistent and overwhelming tiredness that is not alleviated by rest, which can significantly impair individuals' ability to carry out daily activities. Other common symptoms include muscle and joint pain, headache, sleep disturbances, cognitive difficulties (such as memory and concentration problems), sore throat, tender lymph nodes, and flu-like symptoms. The severity of the symptoms can vary among individuals, with some experiencing mild fatigue while others may be bedridden and unable to function normally.
The exact cause of PVFS is still not well understood, but it is believed to result from an abnormal immune response triggered by the viral infection. Factors such as genetic predisposition, viral load, and individual susceptibility may also play a role. PVFS is diagnosed based on the presence of persistent fatigue for at least six months, the exclusion of other medical conditions, and the presence of additional symptoms.
Management of PVFS primarily focuses on symptom relief and improving quality of life. This may include a combination of medication to manage specific symptoms, such as pain relievers or sleep aids, as well as lifestyle modifications like pacing activities and conserving energy. Cognitive behavioral therapy and graded exercise therapy have shown some benefits in managing symptoms and improving functional capacity for some individuals with PVFS.