性交

Some of the patients have no obvioussymptom of abdominal pain, they only behave off colour, insomnic, tired, and so on.

临床表现为反复发作的下腹部坠胀疼痛、腰骶部酸痛，劳累或交后加重，伴疲乏无力，或伴有低。

Head and neck muscles often tighten during sexual activity, and blood pressure can increase at orgasm, causing blood vessels in the brain to dilate, a condition technically named coital cephalgia.

活动中，头部和颈部的肌肉通会收缩，而潮时血压会增。情况会导致大脑中的血管扩张，学术上种情况被称为“交头痛”。