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、腰骶部，累或性交后加重，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.

在性活动中，头部和颈部的肌肉通会收缩，而性高潮时血压会增高。些情况会导致大脑中的血管扩张，在学术情况被称为“性交性头”。