Poor digestion can be caused by defective mastication of the food in the mouth.

消化不良可能是因为嘴里的食物没有完全嚼碎而引起的。

Dryness of the skin can also be caused by living in centrally heated homes and offices.

皮肤干燥还会因呆在有中央供暖的居室或办公室而引起。

Anxiety can be caused by lack of sleep.

睡眠不足可能导致焦虑。

Chafing can be caused by loose running clothing, so it's better to wear clothes that are snug.

宽松的跑步服也会引起擦伤，所以最好穿紧身的跑步服。

Menstrual cramps also may be caused by.

痛经还有可能由以下原因引起。