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下腹部坠胀疼痛、腰骶部酸痛，劳累或性交后加重，无力，或有低热。

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，头部和颈部肌肉通会收缩，而性高潮时血压会增高。这些情况会导致大血管扩张，在学术上这种情况被称为“性交性头痛”。