After a period of prolonged stability, individuals who had been infected and recovered from<unk>  begin to experience new signs and symptoms, characterised by muscular atrophy (decreased muscle mass), weakness, pain, and fatigue in limbs that were originally affected or in limbs that did not seem to have been affected at the time of the initial<unk>  illness.<unk>  is a very slowly progressing condition marked by periods of stability followed by new declines in the ability to carry out usual daily activities. Most patients become aware of their decreased capacity to carry out daily routines due to significant changes in mobility and decreasing upper limb function and lung capability. Fatigue is often the most disabling symptom; even slight exertion often produces disabling fatigue and can also intensify other symptoms. Problems breathing or swallowing, sleep-related breathing disorders, such as sleep apnea, and decreased tolerance for cold temperatures are other notable symptoms. Increased activity during healthy years between the original infection and onset of<unk>  can amplify the symptoms. Thus, contracting<unk>  at a young age can result in particularly disabling<unk>  symptoms. A possible early occurring and long-lasting sign is a slight jitter exhibited in handwriting.
Post-polio syndrome
Leukomyelitis
Guillain–Barré syndrome
FACES syndrome
Acute disseminated encephalomyelitis
Eastern equine encephalitis
Tension myositis syndrome
Postvaccinal encephalitis