性交的

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下腹坠胀疼痛、腰骶酸痛，劳累或交后加重，伴疲乏无力，或伴有低热。

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.

在活动中，头和肌肉通会收缩，潮时血压会增。这些情况会导致大脑中血管扩张，在学术上这种情况被称为“交头痛”。