Criteria: >8 points is diagnosed as positive. PS: Among them,

Characteristics of each episode include:

① Erythema over the joint (reported or observed);

② Joint that cannot tolerate touch or pressure;

③ Difficulty walking or inability to use the joint;

Disease course includes: ≥2 episodes of symptoms, regardless of anti-inflammatory use:

① Maximum pain time < 24 hours;

② Symptoms resolve within ≤14 days;

③ Complete resolution between episodes (return to baseline level);