Study on the association between moxibustion feeling and effect of heat-sensitive moxibustion for primary dysmenorrhea

INTERVENTION: Acupoints:We will search for temperature‐sensitive points at Guan‐yuan. The acupoint group will be divided into heat‐ sensitive group and non‐ heat‐ sensitive group based on sensitization of acupoint. Surface temperature feeling will be assessed before moxibustion intervention. The time of moxibustion is about 45 minutes. Moxibustion sensation will be recorded. The trial will also measure clinical curative effect score A;Non‐acupoint:We will search for temperature‐sensitive points at 3 cun beyond Guan‐yuan. The non‐acupoint group will be divided into heat‐ sensitive group and non‐ heat‐ sensitive group based on sensitization of acupoint. Surface temperature feeling will be assessed before moxibustion intervention. The time of moxibustion is about 45 minutes. Moxibustion sensation will be recorded. The trial will also measure clinical curative effect score.; CONDITION: primary dysmenorrhea PRIMARY OUTCOME: Dysmenorrhea symptom score; SECONDARY OUTCOME: Patients moxibustion sensation;Simplified McGill pain ask scale;Surface temperature feeling threshold; INCLUSION CRITERIA: 1. Primary symptom is periodic abdominal pain before or after menstruation; 2. Aged between 18 and 30 years old, willing to accept the treatment methods provided; 3. Do not take drugs and accept other treatments for primary dysmenorrhea within one month of the trial.