It has nothing to do with happiness. According to Apple Green Health Network, women's narrow shoulders have nothing to do with happiness, and the reasons for women's narrow shoulders are as follows:

1、

Heredity: Shoulder width is determined by the length of pelvis, thorax and humerus, and these characteristics play an important role in heredity.

2, malnutrition: malnutrition or malnutrition may affect growth and development, resulting in women's shoulder width.

3, lack of exercise: lack of exercise muscles may lead to muscle atrophy, smaller size, including shoulder muscles will also be affected.