Swine flu can cause fever, head and muscle pain, cough, sore throat and stomach problems.
猪流感能引起发烧，头痛，肌肉疼痛，咳嗽，喉咙痛和胃部的症状。
Serious eye strain can lead to persistent headaches, muscle pain in the head, neck and upper back, as well as long term problems like myopia.
严重的眼疲劳会导致长期的头痛，头部，颈部和上发背的肌肉疼痛，也可能会引起一个长期的问题近视。
Other signs of concussion are stomach and head pain, muscle weakness and a loss in sharpness of vision.
脑震荡的其他症状有胃痛、痛，肌肉无力，视力下降。
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