Simplify the following text for a Grade 10 native English-speaking person.
Original: It is generally estimated that false pregnancy is caused due to changes in the endocrine system of the body , leading to the secretion of hormones which translate into physical changes similar to those during pregnancy .
Simplified: False pregnancy is probably caused by changes in the endocrine system of the body , which leads to the secretion of hormones . These hormones are the reason physical changes happen , similar to those during pregnancy .