<unk>  in hands of a Scandinavian male, 52, after holding a book). The most prominent symptoms of<unk>  are episodes of erythema, swelling, a painful deep-aching of the soft tissue (usually either radiating or shooting) and tenderness, along with a painful burning sensation primarily in the extremities. These symptoms are often symmetric and affect the lower extremities more frequently than the upper extremities. Symptoms may also affect the ears and face. For secondary<unk> , attacks typically precede and are precipitated by the underlying primary condition. For primary<unk> , attacks can last from an hour to months at a time and occur infrequently to frequently with multiple times daily. Attacks most frequently occur at night, thus having the potential to greatly interfere with sleep. Common triggers for daytime episodes are exertion, heating of the affected extremities, and alcohol or caffeine consumption, and any pressure applied to the limbs. In some patients sugar and even melon consumption have also been known to provoke attacks. Many of those with primary<unk>  avoid wearing shoes or socks as the heat this generates is known to produce<unk>  attacks. The coexistence of<unk>  and Raynaud's phenomenon is rare, but case studies of patients with both diagnoses have been reported in medical journals. Symptoms may present gradually and incrementally, sometimes taking years to become intense enough for patients to seek medical care. In other cases symptoms emerge full blown with onset. Epidemic<unk>  is characterized by burning pain in the toes and soles of the feet, accompanied by foot redness, congestion, and edema; a few patients may have fever, palpitations, headache, and joint pain. In the 1987 epidemic in Hubei, 60.6% of patients had a common cold before the onset of<unk>  and 91.2% had pharyngitis.
Erythromelalgia
Coxalgia
Pathergy
Chromesthesia
Pressure urticaria
Heat urticaria
Onycholysis
Allodynia