----- Nội dung dịch tự động từ ảnh ----- V. Headache is a very common disease. The symptoms (21). a headache are various. People may (22). . pains only one side of the head. Sometimes when the pain goes away, the head is sore. People have a headache (23) . they work too hard or they are too nervous about something. (24) . can help cure the disease but people usually have to do more than taking tablets. They can prevent headaches by changing their diets or their (25). . or simply by going to bed.