Why do my tests drop sometimes?

The descent of the testicles is a normal part of male fetal development. 

Normal Developmental Process: In many cases, particularly in infants and young boys, the testicles can move between the abdomen and scrotum due to various factors including temperature changes and muscle contractions. This movement is often referred to as “retractile testicles.”

Temperature Regulation: The scrotum acts as a temperature regulator for the testes. When it is warm, the muscles relax, allowing the testes to hang lower in the scrotum. Conversely, when it is cold or during physical activity, the cremaster muscle contracts, pulling the testes closer to the body for warmth.

Hormonal Influences: Hormones play a significant role in testicular descent and positioning. Testosterone levels influence how well the testes can descend into their proper position within the scrotum.

Physical Activity: Engaging in physical activities can also cause temporary retraction of the testicles due to muscle contractions around the groin area.

Anatomical Variations: Some individuals may have anatomical variations that allow for more mobility of their testicles than others.

Health Conditions: In some cases, underlying health conditions or hormonal imbalances can affect how well the testes descend or remain positioned within the scrotum.

In summary, if you notice that your testes drop sometimes but not consistently, it could be due to normal physiological responses related to temperature regulation, muscle contractions during physical activity, or hormonal influences.