When cold and nervous, the erector spinae muscle rises up and make goose bumps, which is a physiological phenomenon. At the same time, the clinical goosebumps refers to keratosis pilaris, and the cause of keratosis pilaris is mainly related to hereditary factors, skin diseases, other diseases and other factors. Erection of the erector spinae muscle: When cold or nervous, the erector spinae muscle is erected and goosebumps are made, which is a physiological phenomenon. Keratosis pilaris is also known as goose bumps, and its possible causes are as follows: 1. Genetic factors, if someone in the family has keratosis pilaris, the likelihood of this disease in offspring will be elevated. 2. Vitamin metabolism disorders: vitamin A and vitamin B12 deficiencies may be associated with the development of keratosis pilaris. 3. Other diseases, such as thyroid dysfunction or Cushing’s syndrome, may predispose to or exacerbate keratosis pilaris. If keratosis pilaris is already present, it is recommended to consult a doctor for timely examination and treatment.