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坠胀疼、腰骶酸，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，和颈的肌肉通会收缩，而高潮时血压会增高。这些情况会导致大脑中的血管扩张，在学术上这种情况被称为“交”。