The symptoms of CFS vary from person to person and based on the severity of the condition. The most common symptom is fatigue that is severe enough to interfere with your daily activities. For CFS to be diagnosed, fatigue must last for at least six months and must not be curable with bed rest, and you must have at least four other symptoms as well.
Other symptoms of CFS may include:
loss of memory or concentration feeling unrefreshed after a night’s sleep chronic insomnia (and other sleep disorders) muscle pain
multijoint pain without redness or swelling
frequent sore throat
tender lymph nodes in your neck and armpits
You may also experience illness or extreme fatigue after physical or mental activities. This can last for more than 24 hours after the activity.
People are sometimes affected by CFS in cycles, with periods of feeling worse and then better again. Symptoms may sometimes even disappear completely (remission). However, it’s still possible for them to come back again later (relapse). The cycle of remission and relapse can make it difficult to manage your symptoms