A nervous penis shrinks, may be related to obesity, hidden penis and other reasons. 1. Obesity: for over-obese people, due to the adipose tissue in front of the pubic bone, the fat pad is thicker, the penis is hidden in the back of its own volume will appear short, nervous sympathetic nerve excitation, the skin mucous membrane contraction appears to be even smaller, visually appeared to have shrunk the feeling. When there are no adverse symptoms, there is no need for special treatment at this time, weight loss can be. 2. Invisible penis: these patients have fibrosis of the penile meatus membrane, the penis volume appears smaller, and the excessive contraction of the mucous membrane of the skin when nervous, making it even smaller. Surgical removal of the excess fibrosis of the meatus can be restored. Seek prompt medical attention when there is an aggravation of the symptoms described.