The British forced the issue by attacking the Chinese port cities of Guangzhou and Tianjin in the Second Opium War (1857â1858). Under the most-favored-nation clause, all of the foreign powers operating in China were permitted to seek the same concessions of China that Great Britain achieved by force.
The number of concussions experienced and whether teens also had headaches or nausea were not related to whether they also had emotional symptoms. Researchers also found that having a family history of psychiatric problems did not make teens any more or less likely to have emotional symptoms after a concussion.
Here are some signs you might have a concussion: 1  You feel dizzy after bumping your head, and it goes on for more than a couple of minutes. 2  You have a headache that goes on for more than a few minutes. 3  Things look blurry or you have trouble focusing.  You throw up or feel like throwing up.